Crystal structure of tetra-phenyl phosphate tetra-kis-[dimethyl (2,2,2-tri-chloro-acet-yl)phos-pho-ramidato]lutetium(III), PPh 4 [Lu L 4 ].

A lutetium(III) complex based on the anion of the ligand dimethyl (2,2,2-tri-chloro-acet-yl)phospho-ramidate (H L ) and tetra-phenylphosphonium, of composition PPh 4 [Lu L 4 ] ( L = CAPh = carbacyl-amido-phosphate), or (C 24 H 20 )[Lu(C 4 H 6 Cl 3 NO 4 P) 4 ], has been synthesized and structurally characterized. The X-ray diffraction study of the compound revealed that the lutetium ion is surrounded by four bis-chelating CAPh ligands, forming the complex anion [Lu L 4 ] - with a coordination number of 8[O] for Lu III , while PPh 4 + serves as a counter-ion. The coordination geometry around the Lu 3+ ion was determined to be a nearly perfect triangular dodeca-hedron. The complex crystallizes in the monoclinic crystal system, space group P 2 1 / c , with four mol-ecules in the unit cell. Weak hydrogen bonds O⋯HC(Ph), Cl⋯HC(Ph) and N⋯HC(Ph) are formed between the cations and anions. For a comparative study, H L -based structures were retrieved from the Cambridge Structural Database (CSD) and their geometries and conformations are discussed. A Hirshfeld surface analysis was also performed.