Rhodium(III) and iridium(III) pentamethylcyclopentadienyl complexes with tris(2-carboxyethyl)phosphine, properties and cytostatic activity

New pentamethylcyclopentadienyl complexes [M(C 5 Me 5 )Cl 2 (TCEP)] (M = Rh null 1 , M = Ir null 2 ) with P(C 2 H 4 COOH) 3 null (TCEP) were investigated using IR, null 1 H, null 13 C, null 31 P NMR and ESI-MS spectroscopies. Geometry optimization in the gas phase at the B3LYP/3-21G** level indicated that complex null 1 null has stable pseudooctahedral structure with large HOMO–LUMO gap. Calculated and experimental IR spectra of null 1 null...