Rare earth 3-(4′-hydroxyphenyl)propionate complexes

Deacon, Glen B., Junk, Peter C., Lee, Winnie W., Forsyth, Maria and Wang, Jun 2015, Rare earth 3-(4′-hydroxyphenyl)propionate complexes, New journal of chemistry, vol. 39, no. 10, pp. 7688-7695, doi: 10.1039/c5nj00787a.

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Title Rare earth 3-(4′-hydroxyphenyl)propionate complexes
Author(s) Deacon, Glen B.
Junk, Peter C.
Lee, Winnie W.
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Wang, Jun
Journal name New journal of chemistry
Volume number 39
Issue number 10
Start page 7688
End page 7695
Total pages 8
Publisher Royal Society of Chemistry
Place of publication Cambridge, Eng.
Publication date 2015
ISSN 1144-0546
1369-9261
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
METAL COORDINATION POLYMERS
CRYSTAL-STRUCTURES
CORROSION-INHIBITORS
X-RAY
CINNAMATE
LANTHANUM
STEEL
CHROMIUM
CHROMATE
COATINGS
Summary The reaction of lanthanoid chlorides or nitrates with sodium 3-(4′-hydroxyphenyl)propionate (Na4hpp) in methanol or water has yielded complexes [La4(4hpp)12(H2O)6]·4H2O·MeOH (1), [Ce2(4hpp)6(H2O)3]·(H2O)·2.5(EtOH) (2a) (after crystallization from ethanol), [Ho(4hpp)3(H2O)2] (5), [Er(4hpp)3(H2O)2]·1.5(H2O) (6), and [Lu(4hpp)3]·H2O crystal composition (7), as well as heterobimetallics [NaCe2(4hpp)7(H2O)2]·3(H2O) (2b), [NaPr2(4hpp)7(H2O)2]·3(H2O) (3), and [NaNd2(4hpp)7(H2O)(MeOH)]·(H2O)·3(MeOH) (4). The structures of homometallic complexes 1, 2a, 6, and 7 reveal one-dimensional coordination polymers and vividly illustrate the effect of lanthanoid contraction with a decline in coordination numbers in the series from 9-11 (1), 9,10 (2a), 8 (6) to 7 (7) through variations in carboxylate coordination and ligation of water. Bimetallic complexes 2a and 4 each exhibit five different carboxylate binding modes as well as coordination of the 4-OH substituent of 4hpp to sodium thereby linking 1D polymer chains into a 2D network with both 9 and 10 coordinate Ln atoms and 6 coordinate sodium. Bulk products after drying lose solvent of crystallization in some cases (2a, 6), or exchange MeOH for water (4). X-ray powder diffraction indicates that bulk 2b and 3 are isotypic, as are bulk 5 and 6. In contrast to the excellent corrosion protection of lanthanum 4-hydroxycinnamate, compound 1 is ineffective in preventing the corrosion of mild steel, thereby establishing the importance of the -CHCH- structural unit of the former in its anti-corrosion properties. However the flexible -CH2-CH2- chain of the 4hpp ligand enables the crystal engineering of its lanthanoid complexes in a wide variety of structures as well as effective crystallization for structure determination, whereas the analogous 4-hydroxycinnamates have so far evaded structural characterization except for Ln = La, Ce owing to crystallization problems.
Language eng
DOI 10.1039/c5nj00787a
Field of Research 030306 Synthesis of Materials
030604 Electrochemistry
03 Chemical Sciences
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081429

Document type: Journal Article
Collection: Institute for Frontier Materials
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