V’NCS, September 25–27, 2014, Sofia, Bulgaria
A SERIES OF Zn2+ COMPLEXES OF 1,2-BIS(DIMETHYL PHOSPHINYLMETHYLENOXY)BENZENE LIGAND – SYNTHESIS, STRUCTURAL CHARACTERIZATION AND SOLUTION CHEMISTRY D. Tsekova1,*, Y. Zhelyazkova1, R. Petrova2, B. Shivachev2, N. Vassilev3, P. Gorolomova1, S. Varbanov3, T. Tosheva3, G. Gencheva1 Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, 1164 Sofia 1 J. Bourchier Blvd., Bulgaria 2 Institute of Mineralogy and Crystallography “Acad. Ivan Kostov”, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 107, 1113 Sofia, Bulgaria 3 Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia 1
Nowadays chemistry of the coordination polymers is characterized with elaborating of large diversity of structural architectures as the challenge is to achieve particular chemical and physical functionalities. A successful approach for their construction is based on proper assembling of metal ions, multidentate organic ligands, inorganic counter ions and a precise choice of reaction conditions. Recently, several series of Mn2+, Cu2+ and Zn2+ coordination polymers of O,O-bidentate and O,N,O-tridentate ligands containing two tertiary phosphine oxides as donor functional groups have been obtained. Herein we report the synthesis, structural characterization,
spectroscopic properties (IR, 1H- and 31P{1H} NMR) of Zinc(II)-halide coordination compounds obtained with bidentate ligand 1,2-bis(dimethyl-phosphinylmethylenoxy)-benzene, L. Studying the influence of the counter ion on their self-assembly and crystallization in polymer structures we proved that the size of halide ions guides the supramolecular structure formation. Thus, the applying of the smaller in size Cl– and Br– ions favours the organic ligand bridging in a polymeric structure while the bigger I– ions – directs to ligand chelation in a mononuclear structure. * E-mail: DTsekova@chem.uni-sofia.bg Keywords: Zn(II) complexes, Coordination polymers, single-crystal structure.
103