A new binuclear lutetium(III) dimethyl-N-trichloroacetylamidophosphate complex with a gamma,gamma '-dipyridyl bridge, {Lu[CC1(3) C(O)NP(O)(OCH3)(2)](3))(2)-mu(gamma,gamma '-dipy)

A new type of binuclear coordination compound of lutetium, {Lu2L6. mu-(gamm a,gamma (')-dipy)} (where L = dimethyl-N-trichloroacetylamidophosphate anio n and gamma,gamma ' -dipy = 4,4 ' -dipyridyl), has been obtained. The IR sp ectroscopic data reveal that the ambidentate phosphoryl ligand is coordinat ed to the metal center in a bidentate manner via the phosphoryl and carbony l oxygen atoms. The crystal and molecular structure of {Ln(2)L(6). mu-(gamm a,gamma ' -dipy)} has been determined by means of X-ray diffraction (tricli nic, space group P (1) over bar with parameters: a = 9.259(2), b = 12.530(3 ), c = 16.548(3) Angstrom, alpha = 85.44(3)degrees, beta = 75.64(3)degrees, gamma = 70.56(3)degrees, Z = 1). The structure is made up of centrosymmetric binuclear molecules, in which t he neutral heterocyclic ligand is coordinated to the metal centers in a bid entate bridging manner via its nitrogen atoms. The coordination number of e ach Lu(III) atom is 7 [60(L-) + N((gamma,gamma ' -dipy)]. Phosphoryl and carbonyl groups of the L- ligands are disposed in syn-positi on and are included in the six-membered chelate metallocycles. The coordina tion polyhedron of lutetium can be described as distorted mono-capped octah edron.