Syntheses, structure and properties of dinuclear Co complexes with bis(catecholate) ligands – Effect of a quinoline ring in the terminal group
Polyhedron(2019)
Abstract
Six dinuclear Co complexes with bis(catecholate) ligands, where the two catechol moieties are connected by acetylene spacer, have been synthesized and characterized. For [Co2(L1)(tpa)2](ClO4)2 (H4L1 = 5,5′-(buta-1,3-diyne-1,4-diyl)bis(3-t-butylcatechol)) it appears that both cobalt ions have an octahedral sphere and the spin states are ls-Co(III) from X-ray crystal structure analysis. On the other hand, complex 6, [Co2(L2)(pbqa)2](PF6)2 (H4L2 = 5,5′-(ethyne-1,2-diyl)bis(3-t-butylcatechol)), was isolated with the mixed valent state CoII(hs)-[Sq-Cat]-CoIII(ls) and shows a spin transition behavior that depends on temperature.
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Key words
Dinuclear Co complex,Bis(catecholate) ligand,X-ray crystal structure,Magnetic property,Effect of ancillary ligand
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