A series of Zn-4f heterometallic coordination polymers and a zinc complex containing a flexible mixed donor dicarboxylate ligand

• Published in: Dalton transactions : an international journal of inorganic chemistry 2013-06, Vol.42 (21), p.7741-7754
• Main Authors: Feng, Xun, Feng, Yu-Quan, Liu, Lang, Wang, Li-Ya, Song, Hong-Liang, Ng, Seik-Weng
• Format: Article
• Language: English
• Subjects: Benzene Derivatives - chemical synthesis; Benzene Derivatives - chemistry; Carboxylic Acids - chemical synthesis; Carboxylic Acids - chemistry; Coordination Complexes - chemical synthesis; Coordination Complexes - chemistry; Crystallography, X-Ray; Lanthanoid Series Elements - chemical synthesis; Lanthanoid Series Elements - chemistry; Ligands; Luminescence; Magnetics; Models, Molecular; Polymers - chemical synthesis; Polymers - chemistry; Pyridines - chemical synthesis; Pyridines - chemistry; Zinc - chemistry
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c3dt33002h

A new zinc compound, together with a corresponding series of Zn-4f heterometallic coordination polymers, namely, [Zn(H2PBDA)(PBDA)]n (1), {[Ln2(PBDA)2·2H2O] [Zn2(PBDA)2Cl2]}n [H2PBDA = 3-(pyridin-3-yl-oxy) benzene-1,2-dicarboxylic acid, and Ln = Pr(2), Nd(3), Eu(4), Gd(5), Dy(6), Ho(7), Er(8)] have been hydrothermally synthesized and characterized systematically. Polymers 2-8 feature two-dimensional (2D) 4,4 networks, containing the original 1D heterometallic double stranded chains composed of [Ln2Zn2(PBDA)2] entities. The extensive hydrogen bonding and π-π stacking interactions were observed to stabilize the extended architectures. The luminescence emission spectra of the polymers vary depending on the lanthanide(III) ion present. Informative magnetic susceptibility measurements show that the same carboxylate bridging fashion of the PBDA ligand results in the different magnetic properties occurring within the heterometallic coordination polymers. In addition, polymer 6 exhibits an interesting slow magnetic relaxation behavior at lower temperatures.