Studies of two lanthanide coordination polymers built up from dinuclear units

• Published in: Journal of rare earths 2013, Vol.31 (1), p.85-93
• Main Authors: Benmerad, B., Aliouane, K., Rahahlia, N., Guehria-Laïdoudi, A., Dahaoui, S., Lecomte, C.
• Format: Article
• Language: English
• Subjects: Bonding strength; Bridges (structures); Chemical Sciences; Coordination polymers; Cristallography; crystal structure; Ferromagnetism; lanthanide organic frameworks; Lanthanides; Lattices; magnetic interactions; Rare earth metals; rare earths; thermal behavior; Three dimensional; 单元; 双核; 反铁磁性; 反铁磁相互作用; 施工单位; 磁学性质; 稀土; 配位聚合物
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60240-3

The two three-dimensional oxo-bfidged lanthanides {[Ln2（C4H2O4）3（H20）4]· 3H2O}3, with Ln=Ho3＋ （1）; Gd3＋ （2）, are isomorphous. They have layer-type structures built up from non-centrosymrnetric dinuclear unit Ln2O12（H2O）4, beside three lattice H20 molecules stabilizing the 3D open-frmnework. The building entities are linked through one classical syn-anti g2-carboxylato-K1O：K^1O＇ bridge. Within the bi-polyhedra, two double μ2-O＇; K2O,O＇ bridges and a syn-syn classical one, support the magnetic measurements carried out on holmium compound indicating relatively weak anti-ferromagnetic interactions. The compari- son with magnetic studies on the almost similar reported Gd（III） compound, suggested that concomitant antiferromagnetic and ferro- magnetic properties could not be excluded. The two distinct thermal behaviors evidenced the higher metal-water bond strength with the smaller cation, and revealed the great supramolecular effects generated by hydrogen-bonding patterns.