文摘
Nucleophilic attack by the carbanion at the carbonyl atom of di-2-pyridyl ketone, (py)2CO, in the presence of NiII under basic conditions has yielded the cationic cluster [Ni4{(py)2C(CH2COCH3)(O)}4](ClO4)4 (1). The cluster cation possesses a distorted cubane {Ni4(¦Ì3-OR?4}4+ core resulting from the ¦Ç1:¦Ç3:¦Ç1:¦Ç1:¦Ì3 coordination mode of the in situ formed ligand and has a diamagnetic ground state.