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The well-known compound tetrakis(tert-butylammonium)-cyclo-tetrametavanadate (V), [(CH

Objective To calculate the prevalence and describe the main demographic characteristics of Sjogren's syndrome in adults in Colombia. Material and methods Descriptive cross-sectional study which utilised data from the Integral Information System of Social Protection of the Ministry of Health of the Republic of Colombia during the years 2012 to 2016. Results 58,680 cases of Sjogren's syndrome were identified, with a prevalence in those over 18 years of age of 0.12%; 82% were women, with a female:male ratio of 4.6:1, with a higher prevalence in the age group of 65–69 years. The departments with the highest numbers of cases were Bogota DC (24,885), Antioquia (9040) and Valle del Cauca (5277); however, the departments with the highest prevalences were Caldas (0.42%), Bogota DC (0.32%) and Antioquia (0.14%). Conclusions We present demographic and epidemiological information on Sjogren's syndrome in Colombia. There are very few epidemiological studies of this disorder. However, a prevalence similar to that reported in countries of the region such as Brazil (0.17%) and Argentina (0.17%) was documented.

Resumen Objetivo Calcular la prevalencia y describir las principales caracteristicas demograficas del sindrome de Sjogren en Colombia. Material y metodos Estudio descriptivo de corte transversal en el que se tomaron los datos del Sistema Integral de Informacion de la Proteccion Social del Ministerio de Salud de Colombia, durante los anos 2012 a 2016. Resultados Se identificaron 58.680 casos, calculandose una prevalencia en mayores de 18 anos de 0,12%. El 82% son mujeres, con una relacion mujer:hombre de 4,6:1, con prevalencia mayor entre el grupo etario de 65 a 69 anos. Los departamentos con mayor numero de casos son Bogota DC (24.885), Antioquia (9.040) y Valle del Cauca (5.277), sin embargo, los departamentos con mayor prevalencia fueron Caldas (0,42%), Bogota DC (0,32%) y Antioquia (0,14%). Conclusiones Se presenta informacion demografica y epidemiologica del sindrome de Sjogren en Colombia. Existen muy pocos estudios epidemiologicos de esta enfermedad, sin embargo, se documento una prevalencia similar a la reportada a paises de la region como Brasil (0,17%) y Argentina (0,17%).

This work was funded by Eusko Jaurlaritza/Gobierno Vasco (EJ/GV, grants IT1291-19 and KK-2020/00008) and Ministerio de Ciencia e Innovación (MCIN, grant MAT2017–89553-P). E.R.B. is indebted to EJ/GV for her predoctoral fellowship (PRE_2018_1_0143). E.C. thanks MCIN/AEI/10.13039/501100011033/ “FEDER Una manera de hacer Europa” (project PGC2018 102052-B-C21) and the I+D+i FEDER program 2018 of Junta de Andalucı́a (Project A-FQM-172-UGR18) for financial support., The reaction of mid to late lanthanide ions with the N,N′-dimethyl-N,N′-bis(2-hydroxy-3-formyl-5-bromobenzyl)ethylene-diamine organic ligand and monolacunary Keggin type [α-SiW11O39]8- anion affords a series of isostructural compounds, namely, K5[LnIII(α-SiW11O39)(C20H22Br2N2O4)]·14H2O (1-Ln, Ln = Sm to Lu). The molecular structure of these sandwich-type complexes is formed by the LnIII ion in a biaugmented trigonal prismatic geometry, which occupies the external O4 site of the organic ligand and the vacant site of the lacunary polyoxometalate (POM) unit. The empty N2O2 coordination site of the organic ligand allows its unprecedented folding, which displays a relative perpendicular arrangement of aromatic groups. Weak Br···Br and ?-πinteractions established between adjacent molecular units govern the crystal packing, which results in the formation of assemblies containing six hybrid species assembled in a chairlike conformation. 1-Gd and 1-Yb display slow relaxation of the magnetization after the application of an external magnetic field with maxima in the out-of-phase magnetic susceptibility plots below ?5-6 K, which is ascribed to the presence of various relaxation mechanisms. Moreover, photoluminescent emission is sensitized for 1-Sm and 1-Eu in the visible region and 1-Er and 1-Yb in the NIR. In contrast, the quenching of metal-centered luminescence in the 1-Tb derivative has been attributed to the out-of-pocket coordination mode of the lanthanide center within the POM fragment. It is demonstrated that the 1-Yb dual magneto-luminescent material represents the first lanthanide-containing POM reported to date with simultaneous slow magnetic relaxation and NIR emission. Solution stability of the hybrid molecular species in water is also confirmed by ESI-mass spectrometry experiments carried out for 1-Tb and 1-Tm., Eusko Jaurlaritza/Gobierno Vasco IT1291-19, KK-2020/00008, I+D+i FEDER A-FQM-172-UGR18, Ministerio de Ciencia e Innovación MAT2017–89553-P, PGC2018 102052-B-C21

Resumen Objetivo Calcular la prevalencia y describir las principales caracteristicas demograficas de la artritis reumatoide en adultos en Colombia. Materiales y metodos Estudio descriptivo de corte transversal en el que se tomaron los datos del Sistema Integral de Informacion de la Proteccion Social del Ministerio de Salud, durante los anos 2012-2016. Resultados Se identificaron 248.995 casos, lo que permite calcular una prevalencia en mayores de 18 anos del 0,52%, de los cuales el 80,7% son mujeres, con una relacion mujer : hombre de 4,2 : 1, con mayor prevalencia entre el grupo etario de 70 a 74 anos. Los departamentos con mayor numero de casos son Bogota D.C. (64.121), seguido de Antioquia (43.771); sin embargo, los departamentos con mayor prevalencia fueron Cesar (1,13%), Casanare (0,96%) y Risaralda (0,93%). Conclusiones Se presenta informacion demografica y epidemiologica de artritis reumatoide en Colombia. Se documento una prevalencia concordante con datos de la region, similar a Brasil (0,46%), Venezuela (0,4%) y Peru (0,55%), menor que Argentina (0,94%) y Mexico (1,6%).

The hybrid compound [Cu(cyclam)(H2O)2]0.5[{Cu(cyclam)}1.5{B-H2As2Mo6O26(H2O)}]·9H2O (1) (cyclam = 1,4,8,11-tetraazacyclotetradecane) was synthesized in aqueous solution by reacting the {Cu(cyclam)}2+ complex with a mixture of heptamolybdate and an arsenate(V) source. Crystal packing of 1 exhibits a supramolecular open-framework built of discrete covalent molybdoarsenate/metalorganic units and additional [Cu(cyclam)(H2O)2]2+ cations, the stacking of which generates squarelike channels parallel to the z axis with an approximate cross section of 10 × 11 Å2 where all the hydration water molecules are hosted. Thermal evacuation of solvent molecules yields a new anhydrous crystalline phase, but compound 1 does not preserve its single-crystalline nature upon heating. However, when crystals are dehydrated under vacuum, they undergo a structural transformation that proceeds via a single-crystal-to-single-crystal pathway, leading to the anhydrous phase [{Cu(cyclam)}2(A-H2As2Mo6O26)] (2). Total dehydration results in important modifications within the inorganic cluster skeleton which reveals an unprecedented solid-state B to A isomerization of the polyoxoanion. This transition also involves changes in the CuII bonding scheme that lead to covalent cluster/metalorganic layers by retaining the open-framework nature of 1. Compound 2 adsorbs ambient moisture upon air exposure, but it does not revert back to 1, and the hydrated phase [{Cu(cyclam)}2(A-H2As2Mo6O26)]·6H2O (2h) is obtained instead. Structural variations between 1 and 2 are reflected in electron paramagnetic resonance spectroscopy measurements, and the permanent microporosity of 2 provides interesting functionalities to the system such as the selective adsorption of gaseous CO2 over N2., A supramolecular open framework built of copper(II)-complexes of a macrocyclic tetraaza ligand and arsenomolybdate anions undergoes a single-crystal-to-single-crystal transformation upon dehydration that implies an unprecedented solid state cluster isomerization. The permanent porosity of the system allows the selective adsorption of CO2 over N2.

Coumarin derivatives are a class of compounds with a pronounced wide range of applications, especially in biological activities, in the medicine, pharmacology, cosmetics, coatings and food industry. Their potential applications are highly dependent on the nature of the substituents attached to their nucleus. These substituents modulate their photochemical and photophysical properties, as well as their interactions in their crystalline form, which largely determines the final field of application. Therefore, in this work a series of mono and dihydroxylated coumarin derivatives with different chemical substituents were synthesized and characterized by UV-Visible spectroscopy, thermal analysis (differential scanning calorimetry (DSC) and TGA), 1H NMR and X-Ray Diffraction to identify limitations and possibilities as a function of the molecular structure for expanding their applications in polymer science., This research was funded by the Basque Government within the framework ELKARTEK through the research project KK-2018/00108 and KK-2019/00077. This work was also funded by the Ministry of Economy and Competitiveness—Spain (MINECO) through the research Projects RTC-2016-4887-4 and RTI2018-096636-J-100 within the framework of the National Programme for Research Aimed at the Challenges of Society

RESUMEN Objetivo: Calcular la prevalencia y describir las principales características demográficas de la artritis reumatoide en adultos en Colombia. Materiales y métodos: Estudio descriptivo de corte transversal en el que se tomaron los datos del Sistema Integral de Información de la Protección Social del Ministerio de Salud, durante los arios 2012-2016. Resultados: Se identificaron 248.995 casos, lo que permite calcular una prevalencia en mayores de 18 años del 0,52%, de los cuales el 80,7% son mujeres, con una relación mujer: hombre de 4,2: 1, con mayor prevalencia entre el grupo etario de 70 a 74 años. Los departamentos con mayor número de casos son Bogotá D.C. (64.121), seguido de Antioquia (43.771); sin embargo, los departamentos con mayor prevalencia fueron Cesar (1,13%), Casanare (0,96%) y Risaralda (0,93%). Conclusiones: Se presenta información demográfica y epidemiológica de artritis reumatoide en Colombia. Se documentó una prevalencia concordante con datos de la región, similar a Brasil (0,46%), Venezuela (0,4%) y Perú (0,55%), menor que Argentina (0,94%) y México (1,6%). ABSTRACT Objective: To estimate the prevalence and describe the main demographic characteristics of rheumatoid arthritis in adults in Colombia. Material and methods: A descriptive cross-sectional study was conducted using the data taken from the Integral Information System of Social Protection of the Ministry of Health during the years 2012-2016. Results: A total of 248,995 cases were identified, which gave an estimated prevalence of 0.52% in those older than 18 years of age. The large majority (80.7% were women, with a female: male ratio of 4.2:1, and there was a higher prevalence in the 70-74 years age group. The departments with the highest number of cases were Bogota DC (64,121), followed by Antioquia (43,771), but the departments with the highest prevalence were Cesar (1.13%), Casanare (0.96%), and Risaralda (0.93%). Conclusions: Demographic and epidemiological information on rheumatoid arthritis in Colombia is presented. A similar prevalence is reported in other studies from the region, like Brazil (0.46%), Venezuela (0.4%), or Peru (0.55%), but lower than Argentina (0.94%) or Mexico (1.6%).

S. Reinoso, B. Artetxe and J. M. Gutierrez-Zorrilla. Single-crystal-to-single-crystal transformations triggered by dehydration in polyoxometalate-based compounds. En: Acta Crystallographica Section C 2018;74(11):1222-1242. https://doi.org/10.1107/S2053229618011269 Single-crystal-to-single-crystal transformations are solid-state phase transitions between different crystalline states in which the crystal integrity and the long-range structural order are retained through the whole transformation process. Such a phenomenon constitutes the structural response that some compounds afford when being exposed to a given external stimulus (temperature, pressure, light, etc.) and, therefore, its study has become a relevant focus of interest within crystal engineering because it allows for monitoring how certain properties (colour, magnetism, luminescence, porosity) of the stimuli-responsive material are modified as the structure evolves into the activated form. A range of organic, inorganic and hybrid systems have been found to undergo such phase transitions, but these examples only include a small number of compounds that incorporate polyoxometalate anions, among which the removal of guest solvent molecules (dehydration) stands out as the most common external stimulus able to induce the occurrence of a single-crystal-to-single-crystal transformation. This feature article compiles the examples of dehydration-triggered single-crystal-to-single-crystal transformation studies that have been reported to date for polyoxometalate-based compounds and reviews some of their most relevant structural aspects. © International Union of Crystallography, 2018 The following institutions are acknowledged for support: Universidad Pública de Navarra, Obra Social la Caixa and Fundación Caja Navarra (contract to SR in the framework of the program ‘Captación del Talento’); Universidad del País Vasco UPV/EHU (grants PPG17/37 and GIU17/050); Ministerio de Economía, Industria y Competitividad (grant MAT2017-89553P).

The hybrid compound [{Cu(cyclam)}3(W7O24)]·15.5H2O (1) (cyclam= 1,4,8,11-tetraaza-cyclotetradecane) was synthesized by reacting the {Cu(cyclam)}2+ complex with a tungstate source in water at pH = 8. Compound 1 exhibits an unprecedented three-dimensional covalent structure built of heptatungstate clusters linked through metalorganic complexes in a POMOF-like framework that displays water-filled channels. This dynamic architecture undergoes two sequential single-crystal-to-single-crystal transformations upon thermal evacuation of water molecules to result in the partially dehydrated [{Cu(cyclam)}3(W7O24)]·12H2O (2) and anhydrous [Cu(cyclam)]0.5[{Cu(cyclam)}2.5(W7O24)] (3) crystalline phases. These transitions are associated with cluster rotations and modifications in the CuII coordination geometries, which reduce the dimensionality of the original lattice to layered systems but preserving the porous nature. Phase 3 reverts to 2 upon exposure to ambient moisture, whereas the transition between 1 and 2 proved to be irreversible. The permanent microporosity of 3 was confirmed by gas sorption measurements (N2, CO2), which reveal a system of parallel channels made of wide cavities connected through narrow necks that limit the adsorption process, in good agreement with Grand Canonical Monte Carlo simulations.

A hydrothermal reaction between the monolacunary polyoxometalate [SiW11O39]8–, a copper(II) salt, and 1,4,8,11-tetraazacyclotetradecane (cyclam) affords the first example of a hybrid compound combining metal complexes of such an N4-tetradentate macrocyclic ligand and Keggin-type clusters, namely, [Cu(cyclam)(H2O)][{Cu(cyclam)}2SiW11O39Cu(H2O)]·5H2O (1). This compound has been characterized by infrared spectroscopy and thermal and elemental analyses. Single-crystal X-ray diffraction (scXRD) reveals a layered crystal packing made of corrugated two-dimensional covalent grids in which four octahedral {Cu(cyclam)}2+ bridging moieties connect copper(II)-monosubstituted {SiW11O39Cu(H2O)}6– polyanions to four adjacent clusters, and additional [Cu(cyclam)(H2O)]2+ square-pyramidal counterions are embedded into square-like grid voids. Thermostructural analyses confirm the presence in the 130–250 °C temperature range of a stable and crystalline anhydrous phase, which displays a diffraction pattern different from that of 1. This thermally triggered phase transition proceeds through a single-crystal to single-crystal transformation pathway, which according to scXRD, involves not only the release of water molecules, but also the cleavage and formation of Cu–O bonds induced by the rotation of Keggin-type anions. These modifications fully dismantle the parent two-dimensional covalent assembly to result in the neutral, discrete [{Cu(cyclam)}3SiW11O39Cu] hybrid species (2), in which the cluster exhibits three square-pyramidal {Cu(cyclam)}2+ decorating moieties grafted at its surface. This species must display a five-coordinated copper(II) center in the Keggin skeleton, and therefore, it constitutes one of the scarce examples of such type of coordinatively unsaturated substituted cluster observed in the solid state. The irreversibility of the phase transition has been confirmed by combined thermal and diffractometric analyses, which evidenced also the great flexibility of the supramolecular framework of 2, as this anhydrous phase is able to adsorb up to six water molecules per cluster to lead to the hydrated derivative [{Cu(cyclam)}3SiW11O39Cu(H2O)]·5H2O (2h) without any significant alteration in its cell parameters, nor in its crystalline structure., This work was funded by Eusko Jaurlaritza/Gobierno Vasco (EJ/GV, Grants IT1291-19 and PIBA2018-59) and Ministerio de Ciencia, Innovacion y Universidades (Grant MAT2017- 89553-P). L.F.N. and E.R.B. are indebted to EJ/GV for their predoctoral fellowships (PRE_2019_1_0106 and PRE_2018_1_0143).

Molybdenum, produced in Peru as a byproduct of the copper mining industry, was discovered in the XVIIIth century. It is usually added to steel alloys, is amply used in different pigments and its presence in enzymes makes it a relevant element in life. El molibdeno es un elemento descubierto en el siglo XVIII que, en el Perú, se obtiene asociado a la minería del cobre. Se usa en aleaciones de acero así como en pigmentos y tiene un relevante rol en la vida pues está presente en enzimas importantes.

Our study describes the clinical characteristics of patients with fragility fractures. It also shows there is a low knowledge about osteoporosis and its relation to fractures, in addition to the very poor adherence to medical advice and treatment. Osteoporosis is a systemic skeletal disease associated with an increased risk of fragility fractures and is a public health problem worldwide due to population aging. Early osteoporosis diagnosis and treatment is very important for reducing the incidence of fragility fractures and the resulting complications. Our study describes the clinical characteristics of patients with fragility fractures and their risk factors, evaluates the level of knowledge that patients have about osteoporosis, and follows-up on each case to establish if, after the fracture, a densitometric diagnosis was made and the patient received specific treatment in his outpatient follow-up through his health insurance plan. A descriptive cross-sectional study was carried out in a university hospital in Bogota, Colombia. The data was collected by means of a questionnaire, administered to all patients admitted by the orthopedic emergency department with a diagnosis of fragility fracture. After discharge, a telephone follow-up was done every 3 months for 1 year, and patients were asked if they had already had the dual X-ray absorptiometry (DXA) scan and if they had begun osteoporosis treatment. A total of 111 patients with an average age of 74.4 years (± 11.3 years), of which 84 (75.6%) were women, all consulted for osteoporotic fracture at the orthopedic emergency department of the hospital. Hip fracture was the most frequent (51.4%), followed by vertebral (23.4%), wrist (22.5%), and humerus (4.5%) fracture. A total of 49.5% (n = 55) of the patients did not know what osteoporosis is; 58.6% (n = 65) did not know that fracture is the main complication of this disease, and 62.2% (n = 69) did not associate fractures with osteoporosis. All patients were educated about osteoporosis and the importance of diagnosing and treating it. Patients were given a medical order to have a DXA scan upon discharge; however, only 24.3% (n = 27) had the DXA scan in the first year of the fracture. A total of 33.3% (n = 37) received calcium plus vitamin D, and only 9.9% (n = 11) received osteoporosis treatment (7 bisphosphonate patients and 4 denosumab). No patient received osteoformative therapy. Our study shows that Colombian patients have little knowledge about osteoporosis and its relationship with fragility fractures. It also shows that densitometries are not done and, what is worse, patients with a diagnosis of fracture have limited access to treatment after discharge.

The first decavanadate-based microporous hybrid, namely, [Cu(cyclam)][{Cu(cyclam)}2(V10O28)]·10H2O (1, cyclam = 1,4,8,11-tetraazacyclotetradecane) was prepared by reaction of (VO3)− anions and {Cu(cyclam)}2+ complexes in NaCl (aq) at pH 4.6–4.7 and characterized by elemental analyses, thermogravimetry, and X-ray diffraction (powder, single-crystal) techniques. Compound 1 exhibits a POMOF-like supramolecular open-framework built of covalent decavanadate/metalorganic layers with square-like voids, the stacking of which is aided by interlamellar cementing complexes and generates water-filled channels with approximate cross sections of 10.4 × 8.8 Å2. The framework is robust enough to remain virtually unaltered upon thermal evacuation of all water molecules of hydration, as demonstrated through single-crystal X-ray diffraction studies on the anhydrous phase 1a. This permanent microporosity renders interesting functionality to 1, such as selective adsorption of CO2 over N2 and remarkable activity as heterogeneous catalyst toward the H2O2-based oxidation of the highly-stable, tricyclic alkane adamantane. This work was funded by Eusko Jaurlaritza/Gobierno Vasco (Grant No. IT477-10), MINECO (Grant No. MAT2013-48366-C2-2-P), and UPV/EHU (Grant No. UFI11/53). J.A.-M. thanks Generalitat Valenciana and FEDER (Grant No. PROMETEO2/2014/010), as well as MICINN and Plan E (Grant No. CTQ2012-31762) for financial support.

Two new Melamine-Keggin hybrid nanorods, MELH-PMo12 and MELH-PW12, for the first time are successfully synthesized by two chemical methods, one-step solid-state chemical reaction method and experimental solvent diffusion method at room temperature. One-step solid-state reactions involve grounded nanorod materials along with grinding of row material and with solvent diffusion method these nanorods synthesized in single crystals form. These compounds crystallized in trigonal space groups P-3. Elemental analysis, infrared spectroscopy, UV spectroscopy and XRD analysis results prove that the samples still possess Keggin type structure. Transmittance electron microscopy and single-crystal X-ray have shown that the samples have nanorod structures.

A series of 14 isostructural [Cu(cyclam)](2)[{Cu(cyclam)}4{(a-GeW11O39)Ln(H2O)-(OAc)(12)].18H(2)O (1-Ln, where Ln = La Lu; cyclam = 1,4,8,11-tetraazacyclotetradecane) polyoxometalate-based hybrids reported herein represent (i) the first example of a twodimensional covalent hybrid lattice involving the [{(aXWI 1039)Ln(H2O)(OAc)}2in- archetype and (ii) the first structural characterization of such a dimeric polyoxotungste for Ln = La and Pr as well as for the combination of X = Ge and Ln = Ce, Nd, Sm, or Lu. Compounds 1-Ln have been characterized by elemental analyses, infrared spectroscopy, and thermogravimetric analysis, and their thermostructural behavior has been monitored by powder and single-crystal Xray diffraction. The title compounds undergo two single-crystal-to-single-crystal transformations triggered dehydration leading to the [{Cu(cydam)}6{(alpha-GeW11O39)Ln(H2O)(OAc)}2]-4H(2)O intermediate (2-Ln, where Ln = Eu or Er) and [Cu(cyclam)]0.5[{Cu(cyclam)}55{(alpha-GeW11O39)Ln(0Ac)}2] (3-Ln, where Ln = Ce or Eu) final anhydrous phases, the latter evidencing a coordinatively unsaturated derivative of the dimeric archetype for the first time. These transitions involve formation and disruption of Cu Opom bonds that result in different {Cu(cydam)}(2+) moieties grafting onto and being released from Keggin surfaces, which reduces the dimensionality of 1-Ln to one-dimensional covalent assemblies for 2-Ln and 3-Ln. While all 3-Ln phases rehydrate fully upon exposure to air for 24 h, the kinetics governing the crystal transitions back toward 1Ln through 2-Ln depend on the nature of Ln. Under ambient moisture, the anhydrous structures fully revert back to the parent framework for Ln = La Sm, while the samples containing Eu to Lu afford mixtures of 1-Ln and 2-Ln and require immersion in water for the structural reversion to reach completion. Single-crystal X-ray diffraction analyses of the rehydrated 1R-Ln samples (Ln = Ce, Eu, and Er) support these observations. This work was funded by Eusko Jaurlaritza/Gobierno Vasco (Grant PIBA2018-59 and ELKARTEK bG18 10(2018/00054), MINECO (Grant MAT2017-89553-P), and UPV/EHU (Grants PPG17/37 and GIU17/050). S.R. thanks Obra Social la Caixa, Fundacion Caja Navarra, and UPNA for a research contract in the framework of the program "Captación del Talento". Technical and human support provided by SGIker (UPV/EHU) is gratefully acknowledged.

The structures are reported of six racemic tris­(bipyrid­yl)iron salts with a range of 2-substituted-1,1,3,3-tetra­cyano­propenide anions, mostly also containing either perchlorate or tetra­fluorido­borate as co-anions. In three of the compounds the polynitrile anions are fully ordered, and in three others they are disordered, while the co-anion is also ordered in three compounds, but disordered in two others. Supra­molecular assemblies range from no continuous aggregation up to a three-dimensional hydrogen-bonded framework structure., Structures are reported for six closely related salts of tris­(bipyrid­yl)iron(II) cations, namely tris­(2,2′-bi­pyridine)­iron(II) bis­(1,1,3,3-tetra­cyano-2-meth­oxy­propenide) 0.776-hydrate, [Fe(C10H8N2)3](C8H3N4O)2.0.776H2O, (I), tris­(2,2′-bi­pyridine)­iron(II) 1,1,3,3-tetra­cyano-2-(propyl­sulfan­yl)propenide perchlor­ate, [Fe(C10H8N2)3](C10H7N4S)(ClO4), (II), tris­(5,5′-dimethyl-2,2′-bi­pyridine)­iron(II) 1,1,3,3-tetra­cyano-2-meth­oxy­propenide tetra­fluorido­borate ethanol 0.926-solvate, [Fe(C12H12N2)3](C8H3N4O)(BF4).0.926C2H2O, (III), tris­(5,5′-dimethyl-2,2′-bi­pyridine)­iron(II) 1,1,3,3-tetra­cyano-2-eth­oxy­propenide tetra­fluorido­borate, [Fe(C12H12N2)3](C9H5N4O)(BF4), (IV), tris­(5,5′-dimethyl-2,2′-bi­pyridine)­iron(II) 1,1,3,3-tetra­cyano-2-(ethyl­sufanyl)propenide tetra­fluorido­borate, [Fe(C12H12N2)3](C9H5N4S)(BF4), (V), and tris­(5,5′-dimethyl-2,2′-bi­pyri­dine)­iron(II) 1,1,3,3-tetra­cyano-2-prop­oxypropenide tetra­fluorido­borate, [Fe(C12H12N2)3](C10H7N4O)(BF4), (VI). In compound (I), one of the anions is disordered over two sets of atomic sites with equal occupancies while, in the second anion, just one of the C(CN)2 units is disordered, again over two sets of atomic sites with equal occupancies: the anionic components are linked by multiple C—H⋯N hydrogen bonds to form a three-dimensional framework. In compound (II), the polynitrile anion is disordered over two sets of atomic sites with occupancies in the approximate ratio 3:1, while the perchlorate anion is disordered over three sets of atomic sites: there are C—N⋯π inter­actions between the cations and the polynitrile anion. The polynitrile anion in compound (III) is fully ordered, but the tetra­fluorido­borate anion is disordered over two sets of atomic sites with occupancies 0.671 (4) and 0.329 (4): the cations and the tetra­fluorido­borate anions are linked by C—H⋯F inter­actions to form an inter­rupted chain. Compounds (IV) and (V) are isostructural and all of the ionic components are fully ordered in both of them: the cations and tetra­fluorido­borate anions are linked into C 2 2(12) chains. The polynitrile anion in compound (VI) is disordered over two sets of atomic sites with approximately equal occupancies, and here the chains formed by the cations and the tetra­fluorido­borate anions are of the C 2 2(13) type.