1. Metal-Rich Metallaboranes: Structures and Geometries of Heterometallic μ9-Boride Clusters.
- Author
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Bhattacharyya, Moulika, Yuvaraj, Kuppusamy, Chanda, Alokananda, Ramkumar, Venkatachalam, and Ghosh, Sundargopal
- Subjects
BORIDES ,METAL bonding ,CONDUCTION electrons ,NUCLEAR magnetic resonance ,X-ray crystallography - Abstract
Treatment of a dirhodium analogue of pentaborane(9), [(Cp*Rh)
2 B3 H7 ] (nido‐1; Cp* = η5 ‐C5 Me5 ), with [Fe2 (CO)9 ] at room temperature led to the formation of [(Cp*Rh)2 Fe(CO)3 (µ‐CO)B3 H2 Cl] (2) and the metal‐rich metallaborane [(Cp*Rh)2 Fe(CO)3 Fe(CO)2 (µ‐CO)2 B2 H2 ] (3). When the same reaction was carried out at moderate temperature, two metal‐rich metallaboranes, [(Cp*Rh)3 Fe(CO)2 (µ3 ‐CO)2 B2 HX] 4 (X = H) and 5 (X = Cl), and a heterometallic µ9 ‐boride cluster, [(Cp*Rh)3 (RhCO)3 Fe(CO)3 (µ‐CO)3 B3 H2 ] (6), were obtained. Compounds 4 and 5 can be viewed as cubane clusters with 62 cluster valence electrons (cves) and five metal–metal bonds. In another reaction, the treatment of nido‐1 with [Mn2 (CO)10 ] yielded the heterometallic µ9 ‐boride cluster [(Cp*Rh)3 Rh(CO)2 {Mn(CO)3 }2 B4 H3 ] (7). The cluster cores of both 6 and 7 are comprised of tricapped trigonal prisms containing a µ9 ‐B atom bonded to seven/six metals and two/three boron atoms, respectively. All the new compounds have been characterized by mass spectrometry, IR,1 H,11 B{1 H}, and13 C{1 H} NMR spectroscopy, and X‐ray crystallographic analysis. [ABSTRACT FROM AUTHOR]- Published
- 2018
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