Inorganic Chemistry, Vol.40, No.18, 4691-4695, 2001
Low-valent chemistry of cobalt amide. Synthesis and structural characterization of cobalt(II) amido, aryloxide, and thiolate compounds
The binuclear cobalt(II) amide complex [(CoL2)(2). (TMEDA)] (1) [L = N((SiBuMe2)-Bu-t)(2-C5H3N-6-Me); TMEDA = Me2NCH2CH2NMe2] has been synthesized by the reaction of anhydrous CoCl2 with 2 equiv of [Li(L)(TMEDA)]. X-ray crystallography revealed that complex I consists of two {CoL2} units linked by one TMEDA ligand molecule, which binds in an unusual N,N ' -bridging mode. Protolysis of I with the bulky phenol (ArOH)-O-Me (Ar-Me = 2,6-Bu-t(2)-4-MeC6H2) and thiophenol ArSH (Ar = 2,4,6-(Bu3C6H2)-Bu-t) gives the neutral monomeric cobalt(II) bis(aryloxide) [Co(OArMe)(2)(TMEDA)] (2) and dithiolate [Co(SAr)(2)(TMEDA)] (3), respectively. Complexes 1-3 have been, characterized by mass spectrometry, microanalysis, magnetic moment, and melting-point measurements, in addition to X-ray crystallography.