SYNTHESIS, CRYSTAL-STRUCTURES AND THERMAL-DECOMPOSITION STUDIES OF A SERIES OF COPPER-LANTHANOID COMPLEXES OF 6-METHYL-2-PYRIDONE / BLAKE AJ,CHEREPANOV VA,DUNLOP AA,GRANT CM,MILNE PEY,RAWSON JM,WINPENNY REP // JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS. - 1994. - V. , l. 18. - P. 2719-2727.

ISSN/EISSN:

0300-9246 / нет данных

Type:

Article

Abstract:

A series of mixed copper-lanthanoid complexes have been synthesised and structurally characterised. All the compounds were made from the reaction of {[}Cu6Na(mhp)(12)]NO3 (mhp is the anion of 6-methyl-2-pyridone) with hydrated lanthanoid nitrates in methanol. In each case X-ray crystallographic analysis revealed a central Cu2O2 ring bridged to peripheral lanthanoid (Ln) atoms by mhp ligands. For early lanthanoids (La, Ce and Nd) the complex has a stoichiometry {[}Ln(2)Cu(2)(OMe)(2)(mhp)(4)(NO3)(4)-(Hmhp)(2) (MeOH)(4)], in which the Ln atoms are nine-co-ordinate with approximate tricapped-trigonal prismatic geometry. For later lanthanoids (Gd, Dy and Yb) the stoichiometry is {[}Ln(2)Cu(2)(OMe)(2)(mhp)(4)(NO3)(4)- (Hmhp)(2)(MeOH)(2)] and the Ln atoms are eight-co-ordinate, with a geometry that can be related to a dodecahedron. For Ln = Sm a disordered co-ordination sphere results, presumably caused by the intermediate ionic radius of Sm leading to very similar stabilities for the eight- and nine-co-ordinate structures. Thermal decomposition studies of these complexes have also been carried out which indicate that decomposition occurs initial ly to monometallic oxides or oxide carbonates, followed by production of the mixed-oxide phase Ln(2)CuO(4) (for Ln = La, Nd, Gd or Dy) or Ln(2)Cu(2)O(5) (for Ln = Er or Yb). In most cases CuO is also found. All oxide and oxide-carbonate phases have been characterised by X-ray powder diffraction.

Author keywords:

MAGNETIC-PROPERTIES; MOLECULAR-STRUCTURE; ROUTES

DOI:

10.1039/dt9940002719

Web of Science ID:

ISI:A1994PH53900019

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP 21
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF
Language	English
Keywords-Plus	MAGNETIC-PROPERTIES; MOLECULAR-STRUCTURE; ROUTES
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014 Blake, Alexander/C-3737-2012
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459 Blake, Alexander/0000-0003-2257-8332 Rawson, Jeremy/0000-0003-0480-5386
Number-of-Cited-References	19
Usage-Count-Since-2013	3
Journal-ISO	J. Chem. Soc.-Dalton Trans.
Doc-Delivery-Number	PH539