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Nine new cyanide complexes, {[Cu(aepy)2M(µ-CN)(CN)3]⋅2H2O}n [M(II) = Ni (1), Pd (2) or Pt (3)], [Zn(aepy)2M(µ-CN)(CN)3]n [M = Ni (4), Pd (5) or Pt (6)] and [Cd(aepy)2M(µ-CN)(CN)3]n [M(II) = Ni (7) or Pd (8)] and (Haepy)2[Pt(CN)4] (9) (aepy = 2-(2-aminoethyl)pyridine), were synthesized and characterized structurally using single crystal X-ray diffraction, vibrational spectroscopy, thermal and elemental analyses. The structure analyses revealed that cyanide complexes 1–3 for Cu(II) and 4–6 for Zn(II) are heterobinuclear clusters, whereas the two Cd(II) complexes 7 and 8 are infinite one-dimensional coordination polymers. In heterometallic complexes 7 and 8, the Cd(II) ions are located on a center of symmetry and are coordinated by two nitrogens from cyanide ligands and four nitrogens from aepy ligands, thus showing a distorted octahedral geometry. In 1–9, the intermolecular N–H⋅⋅⋅N hydrogen bonds or/and C–H⋅⋅⋅M interactions (M = Ni(II), Pd(II) and Pt(II)) generate 3D supramolecular networks. [ABSTRACT FROM AUTHOR]

Two tetracyanonickelate(II) complexes with 2-ethylimidazole ligand have been synthesized as single crystal form and characterized by spectroscopic (infrared and Raman) and single crystal X-ray diffraction techniques. Crystallographic investigation shows that heterometallic complexes have one-dimensional coordination polymers. Vibrational assignments are given for all the observed bands and the spectral features also supported to the crystal structures of the polynuclear complexes. The decomposition reaction takes places in the temperature range 30–700 °C in the dry air atmosphere. [ABSTRACT FROM AUTHOR]

Two new heteronuclear (Ni/Cd and Pd/Cd) 2D coordination polymers formulated as namely {[Cd(μ-3aepy)2Ni(μ-CN)2(CN)2]⋅2H2O}n (1) and [Cd(3aepy)Pd(μ4-CN)4]n (2) (3aepy = 3-(2-aminoethyl)pyridine) were obtained and determined using different techniques (FT-IR and Raman spectroscopies, single crystal X-ray diffraction, elemental, SEM–EDX and thermal analyses). Single crystal X-ray study of the complexes revealed that the Ni(II) and Pd(II) ions are coordinated with four cyanide-carbon atoms in square planar geometries. The Cd(II) ions are bridged by 3aepy ligands to generate [Cd2(3aepy)2]2+ cation and adjacent cations are further linked to cyanide ligands from [Ni(μ-CN)4]2− anion, generating corrugated rectangular grid-like 2D sheets in 1. Whereas, the Cd(II) and Pd(II) ions are bridged by cyanide ligands, generating corrugated rectangular grid-like 2D sheets in 2. The Cd1 is possessed the distorted octahedral coordination geometry with six nitrogen atoms from two 3aepy and four cyanide ligands. The Cd2 is coordinated by four nitrogen atoms from cyanide ligands to form a square-planar geometry. Furthermore, the most remarkable properties of the complexes are the existence of the intermolecular C–H⋯M interactions between M(II) and hydrogen atoms of the 3aepy ligands (M(II) = Ni and Pd). [ABSTRACT FROM AUTHOR]

Cyanide- and fumarate-bridged bimetallic complex, poly[μ-fumaratotetraaminedizinc(II) di-μ-cyanodicyanonickel(II) dihydrate], {[Zn2(μ-fum) (NH3)4Ni(μ-CN)2(CN)2]·2H2O}n (1) (H2fum = Fumaric acid) was synthesized and structurally characterized by vibrational (FT-IR and Raman) spectroscopy, single crystal X-ray diffraction and elemental and thermal analyses techniques. The structure of the complex consists of a one-dimensional polymeric chain, in which the Zn(II) and Ni(II) ions are linked by CN groups. The Ni(II) ion is four coordinated with four cyanide-carbon atoms in a square planar arrangement and the Zn(II) ions are four coordinated with one cyanide nitrogen atom, two amine nitrogen atoms and one fumarate oxygen atom, in a distorted tetrahedral arrangement. In the complex, the adjacent chains are connected by strong O-H···O, O-H···N, N-H···O and N-H···N hydrogen bonding interactions to form a three dimensional network. [ABSTRACT FROM AUTHOR]

The synthesis and structural investigation of a new heteronuclear hexacyanochromate(III) complex based on amine containing tetradentate ligand tris(2-aminoethyl)amine ligand (tren) are reported. The complex was characterized by spectral (FT-IR and Raman), elemental, thermal analysis (TG, DTG and DTA) as well as single crystal X-ray diffraction (SC-XRD) techniques. From elemental and spectral data, the formulae, [Cd(tren)(Htren)][Cr(CN) 6 ⋅2H 2 O (1), for the metal complex has been proposed. Single crystal X-ray diffraction (SC-XRD) measurement showed that the asymmetric unit of 1 consists of one Cd(II) ion, one Cr(III) ion, six cyanide ligands, one tren and one Htren ligands and two crystal water molecules. The structure of 1 presents one of tren ligands was protonated and the coordinated to Cd(II) ion as a monodentate ligand. Other tren ligand was also bonded to Cd(II) ion as a tetradentate ligand to form a distorted trigonal-bipyramidal geometry. In the crystal structure, Cr(III) ion is coordinated by six carbon atoms from six different cyanide ligands, thus showing a distorted octahedral coordination geometry. In 1 , The FT-IR and Raman spectral data of the complex compared with the crystallographic data, the results appear to be consistent with each other. Thermal properties of the title complex were investigated by thermogravimetric analysis (TG/DTG/DTA) in the temperature range of 30–700 °C in air atmosphere. Image 1 • A new heteronuclear hexacyanochromate complex was synthesized. • The Cr(III) ion is coordinated by six carbon atoms from six different cyanide ligands, thus showing a distorted octahedral coordination geometry. • FT-IR and Raman spectral data of the complex compared with the crystallographic data, the results appear to be consistent with each other. • The thermal decomposition of 1 in the temperature range of 30–900 °C in air atmosphere was studied using TG/DTG/DTA analysis. [ABSTRACT FROM AUTHOR]