The crystal structure of tris(acetonitrile)nitrosylbis(triphenylphosphine)iridium(III) dihexafluorophosphate. An unusual iridium nitrosyl hexacoordinate complex |
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| Authors: | Maurizio Lanfranchi Antonio Tiripicchio Giuliano Giuliano Mauro Ghedini |
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| Institution: | (1) Istituto di Chimica Generale ed Inorganica, Università di Parma, Centro di Studio per la Strutturistica Diffrattometrica del C.N.R., Parma, Italy;(2) Dipartimento di Chimica, Università della Calabria, 87030 Arcavacata, Cosenza, Italy |
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| Abstract: | Summary The structure of Ir(NCMe)3(NO)(PPh3)2]PF6]2 has been ] determined by x-ray methods. Crystals are orthorhombic, space groupPca 21 , witha = 21.753(14),b = 11.678(10),c = 18.474(12) Å and Z = 4. The structure has been solved from diffractometer data and refined by full-matrix leastsquares to R = 0.076 for 2776 observed reflections. The cation is a hexacoordinate and not a pentacoordinate species as expected. The extra acetonitrile molecule,trans to the nitrosyl ligand, is much more weakly bound to the metal atom Ir-N 2.360(26) against 1.965(20) and 1.912(14) Å for the other two acetonitriles]. The nitrosyl is bent Ir-N-O 111(1)° Å] and acts as the formally one-electron donor NO–. |
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