Transamination reactions of [{(Me3Si)2N}2Sm(thf)2] with the dianion of either 1,1-di-(α-pyrrolyl)cyclohexane or diphenyl dipyrromethane led to the octanuclear complex shown in the picture and the hexanuclear complex [{[Ph2C(α-C4H3N)2]Sm}6(thf)3], respectively. Both clusters possess flat macrocyclic structures and react with dinitrogen to afford the corresponding isostructural tetranuclear dinitrogen complexes.
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Mani et al. (2001) studied this question.
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