169519-88-4Relevant academic research and scientific papers
Chemistry of the Hexaborane(10) Analogue (PPh3)2(CO)IrB5H8:Formation and Characterization of the Heterobimetallaheptaboranes 1,1,1-(CO)3-2,2-(CO)2-2,4-(PPh3) 2-closo-1,2-FeIrB5H4and 2-(CO)-2,2-(PPh3)2-7-Cl-7-(PMe 2Ph)-nido-2,7-IrPtB5H7
Bould, Jonathan,Rath, Nigam P.,Fang, Hong,Barton, Lawrence
, p. 2062 - 2069 (2008/10/09)
The chemistry of the hexaborane(10) analogue (PPh3)2(CO)IrB5H8 (4) has been investigated. The two standard reactions in which metal-containing moieties may be incorporated into the B6H10 cage find success when applied to the iridahexaborane (4). The reaction of Fe2(CO)9 with (PPh3)2(CO)IrB5H8 in C6H6 solution affords 1,1,1-(CO)3-2,2-(CO)22-2,4-(PPh3) 2-closo-1,2-FeIrB5H4 (1) in moderate (28.5%) yield. Except for carborane derivatives, 1 is the first pentagonal bipyramidal metallaheptaborane to be structurally characterized. Compound 1 was identified by NMR, IR, and high-resolution mass spectroscopy and by a single-crystal X-ray diffraction study. Crystal data: triclinic, space group P1, a = 10.675(5) A,b= 10.736(3) A, c = 19.221(7) A, α = 88.90(2)°, β= 78.26(4)°, γ = 71.69(3)°, Z = 2, V = 2045.2(13) A3. Treatment of a THF solution of the sodium anion salt of 4, Na[(PPh3)2(CO)IrB5H7], with [Pt(PMe2Ph)Cl2]2 in CH2Cl2 affords yellow solid 2-(CO)-2,2-(PPh3)2-7-Cl-7-(PMe 2-Ph)-nido-2,7-IrPtB5H7 (2) in 5% yield. 2 is identified similarily. It exists as a nido seven-vertex cluster formally derived by removal of a vertex of connectivity 5 from a closed triangulated dodecahedral polyhedron. Crystal data: monoclinic, space group P21/n, a = 15.434(2) A, b = 18.597(1) A, c = 17.200(1) A, β= 92.73(1)°, Z = 4, V = 4931.1(7) A3. 2 is two skeletal electrons short of the electron count for a classical nido cluster, and it is compared to systems with related structures and also to other systems containing the Pt moiety functioning as a two-orbital two-electon donor.
