Synthesis, IR spectrum, thermal property and crystal structure of cyano-bridged heteronuclear polymeric complex, [Cd(teta)Ni(μ-CN)2(CN)2] · 2H2O

Abstract

The cyano-bridged heteronuclear polymeric complex, [Cd(teta)Ni(l-CN) 2 (CN) 2 ] Á 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-HÁÁÁO and intermolecular N-HÁÁÁO, O-HÁÁÁO and O-HÁÁÁN 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°C in the static air atmosphere.

Complexes Containing N-(2-hydroxyethyl)-ethylenediamine with Tetracyanometallate (II): Synthesis, IR Spectra, Thermal Behavior, Crystal Structure, Magnetic Properties and Catalysis

“…ion is squareplanar and the Ni-C bond distances of 1.860(3) and 1.870(3) Å are expectedly shorter than in [Cu(hydeten) 2 Pd(CN) 4 ] [20] and [Cu(hydeten) 2 Pt(CN) 4 ] [29] because of the difference of ion radii [32]. In contrast, the Ni-C bond lengths of [Zn(hydeten) 2 Ni(CN) 4 ] [23] and [Cd(teta) 2 Ni(l-CN) 2 Ni(CN) 2 ]Á2H 2 O (teta = triethylenetetraamine) [33] are roughly similar to those in c2. In addition, the bond angles of C5-Ni-C5 b and C6-Ni-C6 b (Table 2) are completely linear, as the bond angles of C5-Ni-C6 are almost 90°.…”

Syntheses, spectroscopic and thermal analyses of the hofmann-type metal(II) tetra- cyanonickelate(II) pyridazine complexes: {[M(pdz)Ni(CN)4]∙H2O}n (M = Zn(II) or Cd(II))

“…The shift to lower frequencies of (OH) stretching modes and the shift to higher frequencies of (OH) bending modes (1620-1650 cm -1 ) may be attributed to hydrogen bonding in the complexes. In our previous study [19], the available of water molecules in the structures of the complexes were identified by the vibrational analysis and was supported by X-ray diffraction. Pyridazine vibrations.…”

Syntheses, spectral and thermal analyses of heteronuclear aqua(2-methylpyrazine)metal(II) complexes with tetracyanonickelate ion and crystal structure of supramolecular [Cd(H2O)(2mpz)Ni(μ-CN)4] n complex

“…Hofmann-type complexes are formulated as [M(L) 2 Ni(CN) 4 ] n , where M is a transition metal such as Co(II), Ni(II), Cu(II) or Cd(II), and L is an amine ligand such as ammonia [14], ethylenediamine [7-9, 19, 22], diethylenetriamine [10,21], triethylenetetramine [26] or pyridine [21]. In these complexes, Ni(II) is in a square-planar environment with the C atoms of four CN ligands, and M exhibits octahedral geometry with two L and N atoms of four CN ligands and, therefore, Hofmann-type complexes have a three-dimensional polymeric host structure for inclusion of small guest molecules such as benzene, thiophene and aniline [4,27].…”

“…In our previous [26], we reported the infrared spectrum, thermal property, and crystal structure results of cyanobridged heteronuclear polymeric complex, [Cd(teta)Ni (l-CN) 2 however, to the best our knowledge, neither crystallographic, nor spectroscopic data have been so far would explicitly tell the structural analyses of the 2mpz-metal(II) complexes of tetracyanonickelate(II) ions.…”