Search

The title structure consists of [Ni(CN)4]2– square-planar anions separated by layers of (C10H10N3)+ cations. The crystal packing features N—H⋯N hydrogen bonds, which generate [101] chains., In the title mol­ecular salt, (C10H10N3)2[Ni(CN)4], the dihedral angle between the pyridine rings in the cation is 1.92 (13)° and the complete anion is generated by a crystallographic centre of symmetry. An intra­molecular N—H⋯N hydrogen bond occurs in the cation, which closes an S(6) ring. In the crystal, the components are linked by N—H⋯N and weak C—H⋯N hydrogen bonds, which generate chains propagating in the [101] direction. Weak aromatic π–π stacking inter­actions are also observed. A Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contact types in the crystal packing are N⋯H/H⋯N, C⋯H/H⋯C and H⋯H with contributions of 37.2, 28.3 and 21.9%, respectively.

Two new complexes [Cu(bcen)Ni(CN) 4 ] 2 ( 1 ) and [Ni(bcen)Ni(CN) 4 ] ( 2 ) where bcen is 4,7-diazadecanediamide, were synthesized by reaction of equimolar amounts of M(NO 3 ) 2 (M = Cu and Ni), bcen ligand and K 2 [Ni(CN) 4 ]. Single-crystal X-ray diffraction analysis of compound 1 , shows that the bcen ligand acts as a tridentate chelate, coordinating to the Cu(II) ion via the two nitrogen atoms of the amine groups and one oxygen atom of one amide group, and the other amide unit is left uncoordinated. The coordination geometry around the Cu(II) ions is five coordinate with a distorted square pyramid geometry, comprising two nitrogen atoms and one oxygen atom belonging to the bcen ligand and two nitrogen atoms of the cyano groups of two Ni(CN) 4 2– units. The distance between the copper ion and the amide oxygen of the dangling arm of an adjacent tetranuclear species is within the expected range for an axial Cu–O bond, and hence suggests that the amide oxygen of an adjacent tetranuclear complex may weakly coordinate to the copper ion in an axial position. These contacts link the tetranuclear species into infinite chain polymers.

WOS: 000257332800017, The cyano-bridged heteronuclear polymeric complex, [Cd(teta)Ni(mu-CN)(2)(CN)(2)] center dot 2H(2)O (1), (teta = triethylenetetraamine) was synthesized and characterized by FT-IR spectroscopy, thermal analysis and single crystal X-ray diffraction techniques. It crystallizes in the orthorhombic system, space group Pccn. The asymmetric unit also contains two uncoordinated water molecules. The coordination geometry around the Cd(II) centre is a highly distorted octahedral. In the crystal structure, intramolecular N-H center dot center dot center dot O and intermolecular N-H center dot center dot center dot O, O-H center dot center dot center dot O and O-H center dot center dot center dot N hydrogen bonds, beside the cyano-bridged chains made up of tetracyanonickelate ions coordinated to Cd(II) ions, where the Ni(II) ion is coordinated by four cyanoligands in a square-planar arrangement, link the molecules into polymeric networks parallel to (001) plane, where the hydrogen bonded water molecules occupy the cavities between the layers. The FT-IR spectrum was reported in the 4,000-400 cm(-1) region. Vibration assignments were given for all the observed bands and the spectral feature also supported the structure of the polymeric complex. The decomposition reaction takes place in the temperature range 20-1,000 degrees C in the static air atmosphere.

M(PZA) 2 Ni(CN) 4 {where M=Mn, Co, Fe, Ni or Cd; PZA=pyrazinamide} complexes have been prepared for the first time and their FT-IR spectra are reported in the 400–4000 cm −1 region. The spectral features suggest that the compounds are similar in structure to the Hofmann type two dimensional coordination polymer compounds, formed with Ni(CN) 4 −2 ions bridged by M(PZA) 2 +2 cations. PZA is coordinated to M(II) through the oxygen atom of the carbonyl group.

The coordination polymeric compounds, M(2APM)2Ni(CN)4 (where M=Mn, Co, Ni or Cd; 2APM=2-aminopyrimidine) have been prepared for the first time and their FT-IR spectra are reported in the 400–4000 cm−1 region. The spectral features suggest that the compounds are similar in structure to the Hofmann type two dimensional coordination polymeric compounds, formed with Ni(CN)4−2 ions bridged by M(2APM)2+2 cations. 2APM is coordinated to M(II) through one of the pyrimidine ring nitrogen atoms; the amino group is not involved in the complex formation. The coordination effect on the 2APM vibrational wavenumbers is analysed. The coordination polymeric compounds, M(2-Aminopyrimidine)2Ni(CN)2 (M=Mn, Co, Ni, Cd) have been prepared and their FT-IR spectra are reported.

A series of Hofmann-type clathrate host molecules containing two 2-aminopyridine (2-Apy) groups attached to transition metal (II) (M) tetracyanonickelate frame, with the formula: M(2Apy) 2 Ni(CN) 4 (where M=Mn, Co, Cu or Zn), have been synthesised for the first time. Their FT-IR spectra are reported in the 400–4000 cm −1 region. The spectral features suggest that the compounds are substantially isostructural to that of already known Hofmann type pyridine complex; M(py) 2 Ni(CN) 4 . Moreover, 2Apy pyridine molecules are found to involve coordination through the ring nitrogen. The coordination effect on the 2Apy modes was analysed.