Abstract
Compound [Ir(C(8)H(12))(C(51)H(45)P(4))]Cl(2) or [Ir(cod)(CH(dppm)(2)-κ(3)P,C,P)]Cl(2) (1a), was obtained from [IrCl(cod)](2) and the carbodi-phospho-rane (CDP) salt [CH(dppm)(2)]Cl [where cod = cyclo-octa-1,5-diene and dppm = bis-(di-phenyl-phosphino)methane]. Treatment of 1a with thallium(I) tri-fluoro-methane-sulfonate [Tl(OTf)] and subsequent crystallization gave complex [Ir(C(8)H(12))(C(51)H(45)P(4))](OTf)(2)·CH(3)CO(2)C(2)H(5)·CH(2)Cl(2) or [Ir(cod)(CH(dppm)(2)-κ(3)P,C,P)](OTf)(2)·CH(3)CO(2)C(2)H(5)·CH(2)Cl(2) (1b) [systematic name: (cyclo-octa-1,5-diene)(1,1,3,3,5,5,7,7-octa-phenyl-1,7-diphospha-3,5-di-phospho-niaheptan-4-yl)iridium(I) bis-(tri-fluoro-methane-sulfonate)-ethyl acetate-di-chloro-methane (1/1/1)]. This five-coordinate iridium(I) complex cation adopts a trigonal-bipyramidal geometry with the CDP carbon and one cod double bond in axial sites. Compound 1b represents the first example of a non-meridional coordination of the PCP pincer ligand [CH(dppm)(2)](+) with a P-Ir-P angle of 98.08 (2)°. Compound 2, [IrCl(2)H(C(51)H(44)P(4))]·(CH(3))(2)CO or [IrCl(2)H(C(dppm)(2)-κ(3)P,C,P)]·(CH(3))(2)CO [systematic name: di-chlorido-hydrido(1,1,3,3,5,5,7,7-octa-phenyl-1,5λ(5),7-triphospha-3-phospho-niahept-4-en-4-yl)iridium(III) acetone monosolvate], crystallizes as an acetone monosolvate. It is a six-coordinate Ir(III) coordination compound. Here, the PCP pincer ligand is coordinated in a meridional manner; one chlorido ligand is positioned trans to the carbon donor, the remaining two coordination sites being occupied by the second chlorido and a hydrido ligand trans to each other. Complex 3, [IrCl(2)H(C(51)H(45)P(4))]Cl·5H(2)O or [IrCl(2)H(CH(dppm)(2)-κ(3)P,C,P)]Cl·5H(2)O [systematic name: di-chlorido-hydrido(1,1,3,3,5,5,7,7-octa-phenyl-1,7-diphospha-3,5-di-phospho-niaheptan-4-yl)iridium(III) chloride penta-hydrate], represents the conjugate CH acid of 2. The ligand [CH(dppm)(2)](+) is coordinated in a meridional manner. In the cationic six-coordinate Ir(III) complex 4, [IrClH(CO)(C(51)H(44)P(4))]Cl·2CH(3)OH·H(2)O or [IrClH(CO)(C(dppm)(2)-κ(3)P,C,P)]Cl·2CH(3)OH·H(2)O [systematic name: carbonyl-chlorido-hydrido(1,1,3,3,5,5,7,7-octa-phenyl-1,5λ(5),7-triphospha-3-phos-pho-niahept-4-en-4-yl)iridium(III) chloride-methanol-water (1/2/1)], the chlorido ligand is found in the plane defined by the Ir center and the meridional PCP ligand; the H and CO ligands are positioned axially to this plane and trans to each other.