Please use this identifier to cite or link to this item:
|Title:||Synthesis, characterization and properties of ternary copper(II) complexes containing reduced Schiff base N-(2-hydroxybenzyI)-α-amino acids and 1,10-phenanthroline||Authors:||Yang, C.-T.
|Issue Date:||7-Mar-2003||Citation:||Yang, C.-T., Moubaraki, B., Murray, K.S., Vittal, J.J. (2003-03-07). Synthesis, characterization and properties of ternary copper(II) complexes containing reduced Schiff base N-(2-hydroxybenzyI)-α-amino acids and 1,10-phenanthroline. Dalton Transactions (5) : 880-889. ScholarBank@NUS Repository. https://doi.org/10.1039/b211496h||Abstract:||Ternary copper(II) complexes containing reduced Schiff base ligands (N-(2-hydroxybenzyl)-α-amino acid, where α-amino acid = glycine (H 2sgly), L-alanine (H 2sala) and L-valine (H 2sval)) and 1,10-phenanthroline (phen) have been synthesized and characterized. The neutral mononuclear Cu II complexes [Cu(L)(phen)]·xH 2O (L = sgly (1), sala (2), sval (3)) have been prepared from Cu(OAc) 2·H 2O, H 2L, phen, LiOH in the ratio 1 : 1 : 1 : 2 in H 2O-MeOH. The monodeprotonated Cu II complexes [Cu(HL)(phen)](ClO 4)·xH 2O (L = Hsgly (4), Hsala (5), Hsval (6)) have been obtained from Cu(ClO 4) 2·6H 2O, H 2L, phen, LiOH in the ratio 1 : 1 : 1 : 1 in H 2O-MeOH. The dinuclear Cu II complexes [Cu 2(L)(phen) 3](ClO 4) 2·xH 2O (L = sgly (7), sala (8), sval (9)) were the only product isolated instead of 1-3 when Cu(ClO 4) 2·6H 2O was used in the place of Cu(OAc) 2·H 2O. The electronic spectral titration experiments indicate that the neutral mononuclear compounds could be converted to protonated 4-6 but not vice versa. The protonated phenolic oxygen is involved in medium to weak interaction with Cu II-OH distances, 2.446(3) Å in 4, and 2.73(4) and 2.79(4) Å in 5. Compound 4 is a mononuclear cation while 5 is a helical coordination polymer in the solid state with the carboxylate group in anti-anti bridging mode. The structures of 1,4,5 and 7 have been determined by X-ray crystallography. Variable temperature magnetic measurements of the helical polymer 5 showed very weak ferromagnetic coupling with μ eff per Cu remaining constant at 1.80 BM between 300 and 30 K, then a rapid increase to 2.07 BM at 4 K. Fitting to a Heisenberg S = 1/2 chain model gave a J value of 1.2 cm -1. © The Royal Society of Chemistry 2003.||Source Title:||Dalton Transactions||URI:||http://scholarbank.nus.edu.sg/handle/10635/95144||ISSN:||14779226||DOI:||10.1039/b211496h|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 15, 2020
WEB OF SCIENCETM
checked on Sep 8, 2020
checked on Sep 20, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.