Telser, Joshua; Drago, Russell S., Inorganic Chemistry, 1984, vol. 23, # 17, p. 2599 - 2606
作者:Telser, Joshua、Drago, Russell S.
DOI:——
日期:——
Steps on the way to the first dirhodium tetracarboxylate with no axial ligation: synthetic lessons and a plethora of Rh2(O2CR)4L2−n compounds, n=0, 1, 2
作者:F.Albert Cotton、Elizabeth A. Hillard、Chun Y. Liu、Carlos A. Murillo、Wenning Wang、Xiaoping Wang
DOI:10.1016/s0020-1693(02)01088-5
日期:2002.9
We report the preparation and structural features of thirteen new dirhodium tetracarboxylato compounds. Twelve of these were synthesized in early attempts to create Rh-2(TiPB)(4), where TiPB = 2,4,6-triisopropylbenzoate, the first dirhodium tetracarboxylate without axial ligation, the structure of which is also reported here. Several challenges in the synthesis of such a molecule are identified and discussed. Although axial interactions are of paramount importance for Rh-2(4+) units, Rh-Rh bond lengths are quite insensitive to the nature, presence or absence of axial ligation. However, the effect of axial ligation is clearly observed using electronic spectroscopy; Rh-2(TiPB)(4) shows an extremely low energy pi*(Rh-2) --> sigma*(Rh-2) transition. The energy of this transition is put into the context of previously unreported spectroscopy of Rh-2(O2CCPh3)(4) bis-adducts. (C) 2002 Published by Elsevier Science B.V.