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US5504195A
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Rare earth compounds and their preparation
Assignee: Rhodia Chimie SAS
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Filing: 1994-01-24
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Granted: 1996-04-02
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Expires: 2014-01-24
Abstract
Abstract The invention provides rare earth compounds of formula [(ML3)xA]y where M is one or more of the rare earth metals and yttrium, L is a beta-diketone type ligand, A is a polyether or polyamine, and x and y are each 1 or 2. These compounds are precursors for chemical vapor deposition (CVD) of oxide layers in applications such as superconductors, piezoelectrics, microwaves, fuel cells, radiation detectors, optoelectronics, and catalysts. They are air and moisture stable, low melting, vacuum volatile at low temperatures leaving minimum residue and give good quality metal oxide deposits uncontaminated by fluorine. These compounds also have excellent solubility in a wide range of organic solvents, and are potentially useful as oil lubricant additives and in fuels.
Inventors
- 👤 Timothy J. Leedham
- 👤 Simon R. Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:18
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/003; C23; C23C; C23C16/00; C23C16/06; C23C16/18; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A rare earth compound of formula (ML.sub.3).sub.x A!.sub.y where M represents one or more metals chosen from the rare earth metals and yttrium, L is a bidentate ligand, A is a polyether, polyamine or polyether-amine, and x and y are each 1 or 2 but are not both 2.
Claim 2
Dependent Claim
49 words
A rare earth compound of formula (ML.sub.3).sub.x A!.sub.y where M represents one or more metals chosen from the rare earth metals and yttrium, L is a bidentate ligand, A is a polyether, polyamine or polyether-amine, and x and y are each 1 or 2 but are not both 2.
Claim 3
Dependent Claim
15 words
A compound according to claim 1 wherein L contains a ligand group of formula ##STR4##
Claim 4
Dependent Claim
12 words
A compound according to claim 1 wherein L is a β-diketone ligand.
Claim 5
Dependent Claim
28 words
A compound according to claim 1 wherein the ligand L is a radical of a compound selected from the group consisting of acetylacetone, tetramethylheptanedione, trifluoroacetylacetone, hexafluoroacetylacetone, and 1,5-diphenylpentanedione.
Claim 6
Dependent Claim
65 words
A compound according to claim 1 wherein A is derived from a polyether of formula: ##STR5## wherein R 1 , R 2 and R 3 are each hydrogen or alkyl of 1 to 4 carbon atoms, and n is from 1 to 10, and/or from a polyamine of formula: ##STR6## wherein R 1 , R 2 and R 3 and n are as hereinbefore defined.
Claim 7
Dependent Claim
42 words
A compound according to claim 5 wherein A is derived from a said polyether wherein R 1 and R 2 are each alkyl of 1 to 4 carbon atoms, R 3 is hydrogen, and n is an integer from 1 to 7.
Claim 8
Dependent Claim
26 words
A compound according to claim 5 wherein A is a radical of a compound selected from the group consisting of monoglyme, diglyme, triglyme, tetraglyme, and heptaglyme.
Claim 9
Dependent Claim
42 words
A compound according to claim 5 wherein A is derived from a said polyamine wherein R 1 and R 2 are each alkyl of 1 to 4 carbon atoms, R 3 is hydrogen, and n is an integer from 1 to 3.
Claim 10
Dependent Claim
24 words
A compound according to claim 5 wherein A is a radical of a compound selected from the group consisting of tmeda, pmdeta, and hmteta.
Claim 11
Dependent Claim
45 words
A compound according to claim 1 where L is a radical of a compound selected from the group consisting of acetylacetone, tetramethylheptanedione, or diphenylacetylacetone, A is a radical of a compound selected from the group consisting of monoglyme, tetraglyme, tmeda, and pmdeta, x=1 and y=1.
Claim 12
Dependent Claim
47 words
A compound according to claim 1 wherein L is a radical of a compound selected from the group consisting of acetylacetone, tetramethylheptanedione, trifluoroacetlacetone, hexafluoroacetylacetone, or diphenylacetylacetone, A is a radical of a compound selected from the group consisting of triglyme, tetraglyme, heptaglyme, or hmteta, x=2 and y=1.
Claim 13
Dependent Claim
22 words
A compound according to claim 1 wherein L is derived from tetramethylheptanedione or hexafluoroacetylacetone, A is derived from diglyme, x=1 and y=2.
Claim 14
Dependent Claim
44 words
A compound according to claim 1 wherein M is selected from the group consisting of yttrium, a combination of yttrium with europium or terbium, lanthanum, a combination of lanthanum and thulium, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, or ytterbium.
Claim 15
Dependent Claim
16 words
A compound according to claim 1 having a molecular weight less than 1000 per metal atom.
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