Showing papers by "Bryan M. Gatehouse published in 1996"

Organoamido‐ and Aryloxo‐lanthanoids, 14. Organometallic Compounds of the Lanthanoids, 106. Synthesis and Characterisation of Complexes of Lanthanoid Pyrazolates with 1,2‐Dimethoxyethane and the X‐Ray Structures of (1,2‐Dimethoxyethane‐O1:O2)(1,2‐dimethoxyethane‐O1)tris(3,5‐diphenylpyrazolato)erbium(III) and catena‐Poly[tris(3,5‐di‐tert‐butylpyrazolato)‐μ‐(1,2‐dimethoxyethane‐O1:O2)‐neodymium(III)]

Abstract: The complexes [Ln(Ph2pz)3 (DME)2] and [Ln(tBu2pz)3 (DME)] (Ln = La, Nd, Er; Ph2pzH = 3,5-diphenylpyrazole; tBu2pzH = 3,5-di-tert-butylpyrazole; DME = 1,2-dimethoxyethane) have been prepared by reaction of the lanthanoid metal with bis(pentafluorophenyl)mercury and the pyrazole in DME. The molecular structures of [Er(Ph2pz)3 (DME)2] (3) and [Nd(tBu2pz)3 (DME)]∞ (5) have been determined by X-ray diffraction. Complex 3 has nine-coordinate Er with three chelating Ph2pz ligands and one chelating and one η1-bound DME. There is a trigonal prismatic arrangement of the oxygen donors and the centres of the N – N bonds. 5 was found to be a linear polymer with transoid DME ligands bridging Nd(tBu2pz)3 units in a novel manner. The centres of the N – N bonds (which are essentially coplanar with Nd), and the oxygen donor atoms adopt an arrangement intermediate between trigonal-bipyramidal and square-pyramidal [O – Nd – O 153.5(2)°].

Organoamido‐ and aryloxo‐lanthanoids. XIII [1]. Organometallic compounds of the lanthanoids. CV [2]. New Lanthanoid(III) Complexes with Pyrazolate Ligands

Abstract: The complexes Er(Me2pz)3(thf) and Ln(Ph2pz)3(thf)n (Ln = Sc, Y, Gd, Er, n = 2; Ln = Lu, n = 3) (Me2pz− = 3,5-dimethylpyrazolate, thf = tetrahydrofuran, Ph2pz− = 3,5-diphenylpyrazolate) have been prepared by reaction of the lanthanoid metal with bis(pentafluorophenyl)mercury and the pyrazole in thf. The Ln(Ph2pz)3(thf)2 complexes are considered to be eight coordinate with three η2-Ph2pz ligands. Other lanthanoid pyrazolate complexes, Y(pz)3(thf)2, La(Me2pz)3(thf), Cp2Ln(Me2pz)(thf)n (Ln = Y, Lu, n = 0; Ln = Lu, n = 1), (C5Me5)2Y(pz)(thf), (C5Me5)2Y(Mepz)(thf), (C5Me5)2Y(Me2pz)(thf)2 (pz− = pyrazolate, Mepz− = 3-methylpyrazolate, Cp = cyclopentadienyl) have been synthesized by reaction of LnCl3, Cp2LnCl, or (C5Me5)2LnCl with the appropriate sodium pyrazolate in thf. The structure of Ln(Me2pz)3(thf) (Ln = La or Er) is considered to be a symmetrical dimer with four chelating and two bridging Me2pz groups, and two bridging thf ligands, whereas the cyclopentadienyl complexes are most likely dimers with bridging pyrazolate groups, and lattice thf of solvation. Organoamido- und Aryloxo-Lanthanoidverbindungen. XIII [1]. Metallorganische Verbindungen der Lanthanoide. CV [2]. Neue Lanthanoid(III) Komplexe mit Pyrazolat-Liganden Die Komplexe Er(Me2pz)3(thf) und Ln(Ph2pz)3(thf)n (Ln = Sc, Y, Gd, Er, n = 2; Ln = Lu, n = 3) (Me2pz− = 3,5-Dimethylpyrazolat, thf = Tetrahydrofuran, Ph2pz− = 3,5-Diphenylpyrazolat) wurden durch Reaktion der Lanthanoid-Metalle mit Bis(pentafluorophenyl)quecksilber und den entsprechenden Pyrazolderivaten in thf dargestellt. In den Komplexen Ln(Ph2pz)3(thf)2 besetzen drei η2-Ph2pz Liganden sechs der acht Koordinationsstellen am Ln. Die Pyrazolatkomplexe, Y(pz)3(thf)2, La(Me2pz)3(thf), Cp2Ln(Me2pz)(thf)n (Ln = Y, Lu, n = 0; Ln = Lu, n = 1), (C5Me5)2Y(pz)(thf), (C5Me5)2Y(Mepz)(thf), (C5Me5)2Y(Me2pz)(thf)2 (pz− = Pyrazolat, Mepz− = 3-Methylpyrazolat, Cp = Cyclopentadienyl) wurden durch Reaktion von LnCl3, Cp2LnCl oder (C5Me5)2LnCl mit den entsprechenden Natriumpyrazolaten in thf erhalten. Die Komplexe Ln(Me2pz)3(thf) (Ln = La, Er) sind symmetrische Dimere mit vier chelatisierenden und zwei verbruckenden Me2pz Gruppen neben zwei verbruckenden thf Liganden. Die Cyclopentadienylkomplexe liegen als Dimere mit verbruckenden Pyrazolatgruppen und eingelagertem thf vor.