Ayşegül Şenocak

Preparations, IR spectra and crystal structures of cyano-bridged bimetallic complexes of zinc(II) and cadmium(II) with tetracyanopalladate(II)

The novel heteronuclear compounds [Zn(hydet-en)2Pd(CN)4] (1) and [Cd(hydet-en)2Pd(CN)4] (2) {hydet-en: N-(2-hydroxyethyl-ethylenediamine)} have been synthesized and characterized by elemental analyses and IR spectra. The crystal structures of 1 and 2 have been determined by X-ray diffraction. Structural analysis shows that both compounds have shown a polymeric chain, in which the Zn(II)/Pd(II) and Cd(II)/Pd(II) centres are linked by two CN groups. Both zinc and cadmium atoms are six coordinate with two trans cyanide–nitrogen and four hydet-en N atoms in a distorted octahedron arrangement; the palladium atoms in 1 and 2 are four coordinate with four cyanide-C atoms in a square planar arrangement. The chains in both compounds are connected through weak interchain hydrogen bonds, N–H ··· O, N–H ··· N and O–H ··· N, thereby forming a three-dimensional network.

Synthesis and Structural Studies of PdII/ZnII Architecture with N,N′-Bis(2-hydroxyethyl)ethylenediamine as Capping Ligand

A new compound of the composition [-{Zn-di-μ-bishydeten(O)-Zn}-μ-(CN)2Pd(CN)2] (1) was obtained from the reaction of PdCl2, bishydeten [N,N′-bis(2-hydroxyethyl)ethylenediamine], KCN and ZnCl2 in water/ethanol mixture. This dimeric polymer was characterized by IR spectroscopy and elemental analysis, and its thermal properties were studied by TG and DTG. In addition, the crystal structure was determined by single-crystal X-ray analysis. IR spectroscopy pointed out the existence of both terminal and bridged cyano ligands in the complex structure. When it comes to thermal analysis, the complex followed usual decomposition mechanism in which neutral ligands are decomposed first and then anionic ligands left the structure. Single crystal X-ray analysis revealed that 1 exhibited polymeric structure. An interesting feature of this complex is that ancillary bishydeten ligand acted as a bridge just like cyano groups did. In the complex structure, dimeric Zn units, which were gathered by –O atoms of bishydeten ligands in an asymmetric fashion, were bridged by tetracyanopalladateII anions. 1D chain turned into 3D chains by means of intermolecular hydrogen bonds.

Two novel cyanido-bridged polymeric complexes with suspension bridge type connections and a series of related complex salts: crystallographic and thermal characterizations

In this study, two cyanido-bridged coordination polymers and three cyanido complex salts with the general formulas [M(edbea)Ni(CN)4] {M = Zn (1) and Cd (2); edbea = 2,2′-(ethylenedioxy)bis(ethylamine)} and [Cd(edbea)2][M′(CN)4]·XH2O {M′ = Ni (3), Pd (4) and Pt (5); X = 2 (3) and 0 (4 and 5)} were synthesized and characterized using elemental analysis and FT-IR spectroscopy. X-ray studies of 1–5 exhibited two different coordination modes of the edbea ancillary ligand. While edbea acts as a suspension bridge with two nitrogen atoms positioned in an unusual way between adjacent metal ions for 1 and 2, in the remaining complexes, it behaves as a tetradentate ligand resulting in an eight coordinated CdII center. 3 showed an interesting packing of the cationic components hosted between the layers created by the anions and lattice water molecules. Thermal analysis studies showed that all of the complexes exhibited a similar mechanism in which the neutral groups were released first and then, the anionic ligands decomposed. Also, the complexes with salt structures could not retain their thermal stability as long as the polymeric ones.

1,4-Bis(methyl­sulfan­yl)naphthalene

The molecule of the title compound, C12H12S2, is close to planar, with the methyl C atoms deviating by 0.019 (1) and 0.221 (2) Å from the naphthalene mean plane. In the crystal structure, the shortest S⋯S contact of 3.6864 (9) Å is longer than the van der Waals contact distance.