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- W2257527169 abstract "Two new cationic polyhydrido cluster complexes of iridium have been synthesized and characterized by single-crystal x-ray diffraction and by ir and /sup 1/H and /sup 31/P NMR spectroscopy (Ir/sup 3/(dppp)/sub 3/(H)/sub 7/(CO))/sup 2+ (2) and (Ir3/(PN)/sub 3/(H)/sub 7)2+/ (5), where dppp = 1,3-bis(diphenylphosphino)propane and PN = 1-(2-pyridyl)-2-(diphenylphosphino)ethane, were synthesized by the reaction of CO with (Ir/sub 3/(dppp)/sub 3/(H)/sub 7/)/sup 2+/ (1) in CH/sub 2/Cl/sub 2/ solution and H/sub 2/ with (Ir(PN)(COD))/sup +/ (4) in CH/sub 3/OH solution, respectively. Crystal structures for both compounds is reported. The hydride positions were not located in the crystal structure analyses but were deduced from structural and /sup 1/H NMR data. The molecular structure of 2 consists of a bilateral triangle of three iridium atoms with a carbonyl at the vertex and a chelating dppp ligand on each iridium atom. /sup 1/H NMR data with use of acetone-d/sub 6/ as solvent showed that 2 possesses four doubly bridging hydrides and three terminal hydrides, yielding C/sub 1/ symmetry. The molecular structure of 5 consists of an approximately equilateral triangle of three iridium atoms (average Ir-Ir distance 2.746 (1) /angstrom/) with one PN ligand chelated to each iridium atom. /sup 1/H NMR analysis, with use of CD/submore » 2/Cl/sub 2/ as solvent, showed that 5 has one triply bridging hydride and six terminal hydrides, giving C/sub 3/ symmetry. (Ir/sub 3/(dppp)/sub 3/(H)/sub 7/(CH/sub 3/C/sub 6/H/sub 4/NC))/sup 2+/ (3) a complex structurally analogous to 2, was synthesized from 1 and p-tolyl isocyanide in CH/sub 2/Cl/sub 2/ solution and characterized by ir and /sup 1/H and /sup 31/P NMR spectroscopy. 44 refs., 3 figs., 3 tabs.« less" @default.
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- W2257527169 date "1988-01-27" @default.
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- W2257527169 title "Cationic polyhydrido cluster complexes. Crystal and molecular structures of (Ir/sub 3/(Ph/sub 2/P(CH/sub 2/)/sub 3PPh2/)/sub 3(H)7(CO))2+/ and (Ir/sub 3/(Ph/sub 2/P(CH/sub 2/)/sub 2/(2-py))/sub 3/(H)/sub 7/)/sup 2+/" @default.
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