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

The reaction of lanthanoid chlorides or nitrates with sodium 3-(4'-hydroxyphenyl)propionate (Na4hpp) in methanol or water has yielded complexes [La-4(4hpp)(12)(H2O)(6)]center dot 4H(2)O center dot MeOH (1), [Ce-2(4hpp)(6)(H2O)(3)]center dot(H2O)center dot 2.5(EtOH) (2a) (after crystallization from ethanol), [Ho(4hpp)(3)(H2O)(2)] (5), [Er(4hpp)(3)(H2O)(2)]center dot 1.5(H2O) (6), and [Lu(4hpp)(3)]center dot H2O crystal composition (7), as well as heterobimetallics [NaCe2(4hpp)(7)(H2O)(2)]center dot 3(H2O) (2b), [NaPr2(4hpp)(7)(H2O)(2)]center dot 3(H2O) (3), and [NaNd2(4hpp)(7)(H2O)(MeOH)]center dot(H2O)center dot 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 -CH=CH-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.