Journal of Coordination chemistry, ( ISI ), Volume (63), No (18), Year (2010-9) , Pages (3175-3189)

Title : ( Synthesis, X-ray crystal structure, thermal and solution studies of a centrosymmetric metal-organic polymer based on proton transfer methodology )

Authors: Hossein Eshtiagh Hosseini , azam hasanpoor , Nafiseh Alfi , Masoud Mirzaei Shahrabi , Katharina M. Frommb , KATHARINA M. FROMM , Ardeshir Shokrollahi , Fabienne Gschwindb , FABIENNE GSCHWIND , Elham Karami ,

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A 3-D metal–organic coordination polymer based on pyrazine-2,3-dicarboxylic acid (pzdcH2) formulated as {[Mn(pzdc)(H2O)2] 2H2O}n (1), was obtained by the treatment of MnCl2 6H2O with pzdcH2, 8-hydroxy quinoline (8-HQ), and 2-amino-4-methyl pyridine (ampy). In this study, we describe the synthesis, elemental analysis, IR spectroscopy, TG analysis, and single X-ray diffraction. The X-ray single crystal structure reveals that the chemical environment around each Mn(II) is a distorted octahedral by participating one nitrogen, five oxygens from three (pzdc)2 and two water molecules, O5MnN. The centrosymmetric 1-D ladder-like structure of 1 is bridged by oxygens of (pzdc)2 , and Mn–pzdc–Mn bonds are the rungs for our ladder structure. In the crystal structure, intermolecular O–H O hydrogen bonds result in the formation of a supramolecular structure, effective for the stabilization of the structure. The thermal decomposition of 1 indicates that it is quite thermally stable. The protonation constants of ampy, 8-HQ and pzdcH2 as the building blocks of proton transfer systems including pzdcH2-ampy and pzdcH2-8-HQ and the corresponding stability constants of these systems were determined by potentiometric study. The stoichiometry and stability constants of complexes of pzdcH2-ampy and pzdcH2-8-HQ with Mn2þ were investigated by this method in aqueous solution. The results obtained from solution study are comparable with the solid state results.

Keywords

, Manganese; Pyrazine-2, 3-dicarboxylic acid; Crystal structure; Coordination polymer; Solution
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@article{paperid:1017430,
author = {Eshtiagh Hosseini, Hossein and Hasanpoor, Azam and Alfi, Nafiseh and Mirzaei Shahrabi, Masoud and Katharina M. Frommb and KATHARINA M. FROMM and Ardeshir Shokrollahi and Fabienne Gschwindb and FABIENNE GSCHWIND and Elham Karami},
title = {Synthesis, X-ray crystal structure, thermal and solution studies of a centrosymmetric metal-organic polymer based on proton transfer methodology},
journal = {Journal of Coordination chemistry},
year = {2010},
volume = {63},
number = {18},
month = {September},
issn = {0095-8972},
pages = {3175--3189},
numpages = {14},
keywords = {Manganese; Pyrazine-2;3-dicarboxylic acid; Crystal structure; Coordination polymer; Solution studies},
}

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%0 Journal Article
%T Synthesis, X-ray crystal structure, thermal and solution studies of a centrosymmetric metal-organic polymer based on proton transfer methodology
%A Eshtiagh Hosseini, Hossein
%A Hasanpoor, Azam
%A Alfi, Nafiseh
%A Mirzaei Shahrabi, Masoud
%A Katharina M. Frommb
%A KATHARINA M. FROMM
%A Ardeshir Shokrollahi
%A Fabienne Gschwindb
%A FABIENNE GSCHWIND
%A Elham Karami
%J Journal of Coordination chemistry
%@ 0095-8972
%D 2010

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