Mononuclear Coordination Complexes of Fullerene C60 with Zerovalent Cobalt Having S = 1/2 Spin State: Co(η2-C60)(L)(C6H5CN)·(o-C6H4Cl2) (L = 1,2-bis(diphenylphosphino)ethane and 1,1′-bis(diphenylphosphino)ferrocene)
作者： Dmitri V. Konarev , Salavat S. Khasanov , Sergey I. Troyanov , Yoshiaki Nakano , Ksenya A. Ustimenko
DOI: 10.1021/IC401577M
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摘要: Two mononuclear coordination complexes of fullerene C60 with cobalt, Co(η2-C60)(dppe)(C6H5CN)·C6H4Cl2 (1) and Co(η2-C60)(dppf)(C6H5CN)·C6H4Cl2 (2) (dppe is 1,2-bis(diphenylphosphino)ethane dppf 1,1′-bis(diphenylphosphino)ferrocene) have been obtained by sodium fluorenone reduction the Co(dppe)Cl2 or Co(dppf)Br2 mixtures. The IR visible–NIR spectra 1 2 indicate neutral state fullerenes. Therefore, cobalt atoms formally zerovalent state. Cobalt coordinates to 6–6 bond η2-type Co–C lengths in 2.008(3)–2.060(3) A range. Diphosphine benzonitrile ligands additionally coordinate form a distorted square-pyramidal environment for atoms. Complexes are rare examples paramagnetic metal centers. Both manifest intense asymmetric EPR signals attributed atoms, which can be fitted three components g = 2.261–2.124 ...
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