title: Lanthanide complexes of [alpha-2-P2W17O61]10-: solid state and solution studies.
abstract: We have isolated the 1:1 Ln:[alpha-2-P2W17O61]10- complexes for a series of lanthanides. The single-crystal X-ray structure of the Eu3+ analogue reveals two identical [Eu(H2O)3(alpha-2-P2W17O61)]7- moieties connected through two Eu-O-W bonds, one from each polyoxometalate unit. An inversion center relates the two polyoxometalate units. The Eu(III) ion is substituted for a [WO]4+ unit in the "cap" region of the tungsten-oxygen framework of the parent Wells-Dawson ion. The point group of the dimeric molecule is Ci. The extended structure is composed of the [Eu(H2O)3(alpha-2-P2W17O61)]214- anions linked together by surface-bound potassium cations. The space group is P, a = 12.7214(5) A, b = 14.7402(7) A, c = 22.6724(9) A, alpha = 71.550(3), beta = 84.019(3)degrees, gamma = 74.383(3), V = 3883.2(3) A3, Z = 1. The solution studies, including 183W NMR spectroscopy and luminescence lifetime measurements, show that the molecules dissociate in solution to form monomeric [Ln(H2O)4(alpha-2-P2W17O61)]7- species.
authors.affiliation: Department of Chemistry, Hunter College and the Graduate School of the City University of New York, New York, New York 10021, USA.
authors.forename: Qunhui
authors.initials: Q
authors.lastname: Luo
authors.forename: Robertha C
authors.initials: RC
authors.lastname: Howell
authors.forename: Judit
authors.initials: J
authors.lastname: Bartis
authors.forename: Michaela
authors.initials: M
authors.lastname: Dankova
authors.forename: William DeW
authors.initials: WD
authors.lastname: Horrocks
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold
authors.forename: Lynn C
authors.initials: LC
authors.lastname: Francesconi
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D018360:Crystallography, X-Ray; D028581:Lanthanoid Series Elements / Q000138:chemical synthesis* / Q000737:chemistry*; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation
chemical_list: D028581:Lanthanoid Series Elements