Complexes of dodecamethylcyclohexaphosphazene with palladium(II) chloride and platinum(II) chloride. Crystal and molecular structure of cis-dichloro[η2-dodecamethylcyclohexaphosphazene (N,N′)] palladium(II) sesquihydrate

• Published in: Canadian journal of chemistry 1981-08, Vol.59 (16), p.2429-2434
• Main Authors: Paddock, Norman L, Ranganathan, T. N, Rettig, Steven J, Sharma, Rajendra D, Trotter, James
• Format: Article
• Language: English
• ISSN: 0008-4042; 1480-3291
• DOI: 10.1139/v81-350

Dodecamethylcyclohexaphosphazene N 6 P 6 Me 12 , 1 , forms 1:1 complexes with palladium(II) chloride, 2 , and platinum(II) chloride, 3 . Their 31 P, 1 H, and 13 C nmr spectra show them to be rigid molecules in solution, with an approximate plane of symmetry. Crystals of 2 are orthorhombic, a = 17.4030(3), b = 15.4897(5), c = 10.7417(2) Å, Z = 4, space group P2 1 2 1 2. The structure was determined from diffractometer X-ray data and refined by full-matrix least-squares methods to R = 0.031 for 3545 reflections with I ≥ 3σ(I). The metal atom has square planar coordination, and forms 6- and 10-membered chelate rings with the phosphazene ligand. The mean PN bond length is 1.609 Å; the variation of bond lengths within the ring is consistent with model calculations of changes in bond order arising from the localization of bonding electrons.