Formation of new nickel-containing nineteen-vertex metallaborane clusters prepared from the anti-B18H22 borane cluster: molecular structures of [Ni(THF)(4)(H2O)(2)][B18H20Ni(eta(5)-C5H5)](2) and [B18H19(2-THF)Ni(eta(5)-C5H5)]

摘要

The reaction of the anti-B18H22 borane cluster with nickelocene produced several new metallaborane species, [Ni(THF)(4) (H2O)(2)][B18H20Ni(eta(5)-C5H5)](2) (1a), [B18H20Ni(eta(5)-C5H5)] (1b) and [N(CH3)(4)][B18H19 (2-THF) Ni(eta(5)-C5H5)] (2), in relatively high yields. These new complexes were fully characterized by multinuclear NMR (H-1, C-13, B-11), IR and UV-Vis spectroscopy. Single-crystal X-ray diffraction analyses of complexes 1a and 2 confirmed their structures as 19-vertex conjuncto-metallaborane clusters. The structures consist of ten-vertex nido-borane subunits edge-shared with eleven-vertex nido-cluster subunits. In compound 2, formed through the THF reflux of compound 1, a THF molecule was found to coordinate at the 2-position of the borane framework. [References: 21]