Source:http://linkedlifedata.com/resource/pubmed/id/18322622
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
11
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pubmed:dateCreated |
2008-3-6
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pubmed:abstractText |
A novel heterometallic 1D coordination polymer [{Ni(en)2}2(micro-NCS)4Cd(NCS)2](n) x nCH3CN (en = ethylenediamine) has been prepared using the self-assembly process in a one-pot reaction of cadmium oxide, nickel and ammonium thiocyanates with an acetonitrile solution of ethylenediamine. The complex consists of an uncommon cis-Cd(SCN)4(NCS)2(4-) fragment and a rare combination of cis-Ni(en)2(2+) and trans-Ni(en)2(2+) building blocks linked by micro(1,3)-NCS bridges into a double-stranded zigzag chain structure. Each chain is comprised of [Ni2Cd2(micro-NCS-N,S)4)] macrocycles with chair-like and rectangular-like shapes arrayed alternately. The shortest intrachain CdCd separations are 9.535(1) and 10.868(2) A, while the nearest NiNi distances are 5.418(1) and 6.612(2) A. A network of weak N-HS hydrogen bonds, involving the terminal NCS ligands and NH2-groups of en, links the infinite chains and results in the formation of an extended supramolecular three-dimensional framework. Variable-temperature (1.8-300 K) magnetic susceptibilities show a slight change of the micro(B) value at low temperature, indicative of weak antiferromagnetic interactions (J = 1.55 cm-1) between magnetic canters. High-field, high-frequency (100-400 GHz) EPR spectra were simulated using S = 1 ground state for separate Ni2+ ions with the spin Hamiltonian parameters g = 2.165, D = 0.45 cm-1 and E = 0.03 cm(-1). According to DFT calculations, the D and E parameters are -0.35 cm(-1) and 0.049 cm-1 for the cis arrangement of Ni2+ and 0.58 cm(-1) and 0.012 cm(-1) for trans.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Cadmium Compounds,
http://linkedlifedata.com/resource/pubmed/chemical/Ethylenediamines,
http://linkedlifedata.com/resource/pubmed/chemical/Oxides,
http://linkedlifedata.com/resource/pubmed/chemical/Polymers,
http://linkedlifedata.com/resource/pubmed/chemical/Thiocyanates,
http://linkedlifedata.com/resource/pubmed/chemical/cadmium oxide,
http://linkedlifedata.com/resource/pubmed/chemical/ethylenediamine,
http://linkedlifedata.com/resource/pubmed/chemical/nickel thiocyanate
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pubmed:status |
MEDLINE
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pubmed:month |
Mar
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pubmed:issn |
1477-9226
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
21
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1431-6
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pubmed:meshHeading |
pubmed-meshheading:18322622-Cadmium Compounds,
pubmed-meshheading:18322622-Crystallography, X-Ray,
pubmed-meshheading:18322622-Electron Spin Resonance Spectroscopy,
pubmed-meshheading:18322622-Ethylenediamines,
pubmed-meshheading:18322622-Hydrogen Bonding,
pubmed-meshheading:18322622-Isomerism,
pubmed-meshheading:18322622-Magnetics,
pubmed-meshheading:18322622-Models, Molecular,
pubmed-meshheading:18322622-Molecular Conformation,
pubmed-meshheading:18322622-Oxides,
pubmed-meshheading:18322622-Polymers,
pubmed-meshheading:18322622-Spectrophotometry, Infrared,
pubmed-meshheading:18322622-Thiocyanates
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pubmed:year |
2008
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pubmed:articleTitle |
Structural, magnetic, high-frequency and high-field EPR investigation of double-stranded heterometallic [{Ni(en)2}2(micro-NCS)4Cd(NCS)2](n).nCH3CN polymer self-assembled from cadmium oxide, nickel thiocyanate and ethylenediamine.
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pubmed:affiliation |
Department of Inorganic Chemistry, National Taras Shevchenko University, Volodymyrska str. 64, Kyiv, 01033, Ukraine. nesterova@univ.kiev.ua
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, Non-P.H.S.,
Research Support, Non-U.S. Gov't
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