A rhodium(I)—iridium(III) hydrido-bridged phosphine complex

X-ray and neutron diffraction study of the new cationic bis(hydrido)-bridged platinum-iridium complex [(PEt3)2Pt(.mu.-H)2IrH2(PEt3)2 ]+[BPh4]-

“…(1) Á found in compound 5. 22 On the other hand, longer metal-metal distances indicative of weaker interactions are found in the range 2.7-3.0 Á, as in the case of compounds 6-9 (see Table IV). The extent of the metal-metal interaction in 3 is also reflected in the M-H-M angle (mean value 95.5 (1)°),25,33-35 comparable to that of 94.1 (4)°f ound in 11 but smaller, as expected, than the value of 102.7 (1)°f ound in 8, where a long W-W separation is present.…”

“…1.492 0.2 X 0.3 x 0.4 0.71069 (Mo Ka, graphite monochromated) 53.6 C48H84BIrP4Pt 1183.20 22 (1) 18.989 (10) 15.314 (3) 19.792 (6) 118.73 (3) 5047 (4) 2.5 (0.030 A'1 < (sin )/\ < 0.431 A'1), 2.8 (0.431 A'1 < (sin 0)/ < 0.554 A'1), 3.5-4.9 (0.554 A'1 < (sin )/\ < 0.679 A '1) 12.0 12.0 +A,-A:,±/; -h,+k,±l 0.032 It is noteworthy that a recently described hydrogenation catalyst has been assigned the hydrido-bridged structure5 spectively) react with H2 to give complex 3, which is isomeric with + L >H^| >H L 2a and 2'a and isolobal with 1. An X-ray investigation of compounds 2'b and 2c7 (L = PEt3; R = Et and Ph, respectively) has shown that the locations of the non-hydride ligands are such as to indicate that the Pt-Ir bridges may not be symmetrical.…”

Synthesis and Migratory Insertion Reactions of (Vinylidene)iridium Complexes trans-[IrX(CCRR‘)(PiPr3)2] Containing Alkyl, Aryl, Alkynyl, and Azide Ligands,1

“…Colorless crystals precipitated, which were separated from the mother liquor and washed with small amounts of pentane. By comparison of the 1 H NMR, 31 P NMR, and IR spectroscopic data they were identified as [IrH 5 (P i Pr 3 ) 2 ] ( 23 ) …”