Photochemical synthesis and stereochemistry of cobalt(III) complexes containing pyrimidine-2-thionate and derivatives

Autor:	Kensen Okusako, Sumio Kaizaki, Kazuaki Yamanari
Rok vydání:	1992
Předmět:	Bond length chemistry.chemical_compound chemistry Stereochemistry Ligand Diamine chemistry.chemical_element Ethylenediamine General Chemistry Crystal structure Cobalt Methyl group Monoclinic crystal system
Zdroj:	Journal of the Chemical Society, Dalton Transactions. :1615
ISSN:	1364-5447 0300-9246
DOI:	10.1039/dt9920001615
Popis:	Three series of mixed-ligand cobalt(III) complexes containing four-membered N,S chelates [CoLn-(en)3–n](3–n)+[n= 1, 2 and/or 3; HL = pyrimidine-2-thiol (Hpymt), 4-methylpyrimidine-2-thiol (Hmpymt), or 4,6-dimethylpyrimidine-2-thiol (Hdmpymt); en = ethane-1,2-diamine] have been photochemically prepared from robust [Co(en)3]3+ and the free ligand in moderate yields and characterized by their elemental analyses, UV/VIS absorption and 1H and 13C NMR spectra. The crystal structure of [Co(mpymt)(en)2][ClO4]2 was determined from 3329 reflections to R= 0.043 (R′= 0.062): space group P21/n(monoclinic) with a= 10.122(8), b= 9.003(6), c= 20.35(2)A, β= 100.17(7)° and Z= 4. The mpymt ligand co-ordinates through N and S donors and the complex adopts a remote linkage form where the C4 methyl group is distant from the en chelate rings. The Co–N bond length trans to the sulfur atom is slightly longer (0.013 A) than the cis one.
Databáze:	OpenAIRE
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