Michael A.G. Berg

X - ray crystal structure and reactions of 2-Cyano-1,3-dibenzoyl-2,3-dihydrobenzimidazole, a novel reissert compound.

The X-ray crystal structural analysis and energetically favoured conformation calculated by the MM2 method for the new, novel benzimidazole Reissert compound 1 are reported. A highly delocalized and very stable carbanion is interpreted by resonance structures. Interesting reactions of compound 1 are discussed.

mer-Hydridotris(tri­methyl­phosphane-κP)(d-valinato-κ2N,O)iridium hexa­fluorido­phosphate di­chloro­methane 0.675-solvate

The title compound, [Ir(C5H10NO2)H(C3H9P)3]PF6·0.675CH2Cl2, an iridium compound with a meridional arrangement of PMe3 groups, O,N-bidentate coordination of d-valine and with a hydride ligand trans to the N atom is compared with the l-valine complex reported previously. As expected, the complexes from the corresponding l and d isomers of valine crystallize in enantiomorphic space groups (P43 and P41, respectively). In the crystal, N—H⋯O and N—H⋯F hydrogen bonding is observed, the N—H to carbonyl oxygen hydrogen bond producing a helical motif that proceeds along the 41 screw of the c axis.

Tri­methyl­phospho­nium trans-tetra­chlorido­bis­(tri­methyl­phosphane-κP)iridate(III)

The title compound, [HP(CH3)3][IrCl4{(H3C)3P}2], consists of a trimethylphosphonium cation and a tetrachloridobis(trimethylphosphane)iridate(III) anion. The anion has an octahedral arrangement of ligands, with the trimethylphosphane groups occupying trans positions. The IrIII atom sits on an inversion center with one P(CH3)3 ligand and two chloride ligands in the asymmetric unit. The trimethylphosphonium cation is disordered about a twofold rotation axis. The title compound is the first structurally characterized tetrachloridobis(phosphane)iridate complex.