Reduced Bis imino pyridine Cobalt Chemistry

Reduced cobalt compounds have been of longstanding interest in bis(imino) pyridine chemistry. Following the reports of ethylene polymerization activity, efforts were focused on the preparation of various cobalt alkyl derivatives with the goal of understanding the nature of the active species formed upon treatment with methyl 

These studies raised several fundamental questions about the effects of pincer substituents on the overall electronic structure of the resulting cobalt halide or alkyl compound. First, why are the electronic stractures of N-aryl and N-alkyl substituted bis(imino)pyridine cobalt chloride complexes different. Second, why for the N-alkyl derivatives is the chloride compound spin crossover and the methyl diamagnetic. What role does the distortion of the hgand play on the overall electronic structure  

The reactivity of ( PDI)CoN2 was also examined. Exposure to latm of CO furnished the red-brown cobalt carbonyl compound ( P PDI)CoCO, which exhibits a strong C=0 stretch centered at 1975 cm i. Notably, substitution of the carbonyl 

Structure preferences of the bis(imino)pyridine dianion In the neutral 

Budzelaar and coworkers [50] have reported the two-electron reduction chemistry of the corresponding bis(imino)pyridine nickel dihalide derivative. Stirring (iPrpDi)NiBr2 2 equiv ofNaH inTHF under a dinitrogen atmosphere furnished 

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