ISSN:
0044-2313
Keywords:
lanthanoid complexes
;
pyrazolates
;
cyclopentadienides
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Organoamido- und Aryloxo-Lanthanoidverbindungen. XIII [1]. Metallorganische Verbindungen der Lanthanoide. CV [2]. Neue Lanthanoid(III) Komplexe mit Pyrazolat-LigandenDie 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 verbrückenden Me2pz Gruppen neben zwei verbrückenden thf Liganden. Die Cyclopentadienylkomplexe liegen als Dimere mit verbrückenden Pyrazolatgruppen und eingelagertem thf vor.
Notes:
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.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19966220820
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