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Synthesis and Structure of a Series of New Molybdenum(VI) Complexes with the Esters of 2‐Mercaptonicotinic Acid
Author(s) -
Cindrić Marina,
Strukan Neven,
Kajfež Tanja,
Giester Gerald,
Kamenar Boris
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200112)627:12<2604::aid-zaac2604>3.0.co;2-u
Subject(s) - chemistry , molybdenum , crystal structure , octahedron , alcohol , molecule , tetramethylammonium , alkoxide , medicinal chemistry , stereochemistry , catalysis , polymer chemistry , crystallography , organic chemistry , ion
The novel dioxomolybdenum(VI) complexes with methyl ( 1 ), ethyl ( 2 ), n ‐propyl ( 3 ), i ‐propyl ( 4 ), n ‐butyl ( 5 ) and cyclohexyl ( 6 ) ester of 2‐mercaptonicotinic acid have been prepared in the reactions of MoO 2 Cl 2 and MoO 2 (acac) 2 (acac = 2,4‐pentandionate) with mercaptonicotinic acid in corresponding alcohol. The esterification reaction was catalyzed by Mo V originated from the reduction of Mo VI with mercaptonicotinic ‐SH group with simultaneous formation of S–S bond resulting from the condensation of two 2‐mercaptonicotinic molecules. The presence of Mo V was proved by ESR spectra. The molecular and crystal structures of 1 , 2 , 3 and 4 as well as of the by‐products 1,1′‐dithio‐2,2′‐ n ‐butylnicotinoate ( 7 ) and tetramethylammonium hexachloromolybdate(V) ( 8 ) have been determined by a X‐ray single crystal diffraction. The complexes 1 – 4 contain MoO 2 2+ core with octahedral coordination of each molybdenum atom complexed by two 2‐mercaptonicotinato N and S donor atoms.