Structural diversity and magnetic properties of Co(ii)/Mn(ii)/Ni(ii) coordination polymers constructed from an unsymmetrical tetracarboxylic acid and varying N-donor ligands. Issue 30 (29th June 2018)

• Record Type: Journal Article
• Authors: Yue, Qi; Liu, Xu; Guo, Wei-Xiao; Gao, En-Qing
• Is Part Of: CrystEngComm. Volume 20:Issue 30(2018)
• Page Start: 4258
• Page End: 4267
• Publication Date: 2018-06-29
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce00692j
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Seven coordination polymers with diverse structures based on an unsymmetrical tetracarboxylate and varying N-donor ligands were prepared. Complex7 exhibits strong ferromagnetism. Abstract : Seven new coordination polymers (CPs), namely, [M2 (α-bptc)(phen)·2H2 O]·3H2 O (M = Co, for1 ; Mn, for2 ), [M2 (α-bptc)(bpea)·7H2 O]·H2 O (M = Co, for3 ; Ni, for4 ), [Co3 (α-Hbptc)2 (4, 4′-bipy)2 ·4H2 O]·2H2 O (5 ), [Co4 (α-bptc)2 (bpee)3 ·2H2 O]·2H2 O (6 ), and [Ni4 (α-bptc)(4, 4′-bipy)2 (OH)4 ·4H2 O]·13H2 O (7 ) (α-H4 bptc = 2, 3, 3′, 4′-biphenyl tetracarboxylic acid, phen = 1, 10-phenanthroline, bpea = 1, 2-bis(4-pyridyl)ethane, 4, 4′-bipy = 4, 4′-bipyridine, bpee = 1, 2-bis(4-pyridyl)ethylene), based on an unsymmetrical tetracarboxylic acid with the aid of varying ancillary N-donor ligands have been synthesized under hydrothermal conditions. Interestingly, the unsymmetrical tetracarboxylate linked Co(ii )/Mn(ii )/Ni(ii ) ions to give diverse structural fragments, which were connected by various ancillary N-donor ligands, resulting in the formation of CPs with different structural topologies. Complexes1 and2 were isomorphous and showed a 1D tube-like [M2 (α-bptc)·2H2 O] network decorated with phen moiety. Complexes3 and4 were also isomorphous and displayed a 1D ladder-like chain structure assembled by [M2 (α-bptc)·7H2 O] metallacycles as nodes and bpea as linkers. Complex5 featured a 3D CdS net with 4-connected (6 5 ·8) topology constructed by the combination of 1D [Co3 (α-Hbptc)2 ·3H2 O] zigzag chain and 4, 4′-bipy. Complex6 exhibited a novel 3D framework with (4, 4, 6)-connected (4 2 ·4 2 ·6) topology formed through the integration of [Co2 (α-bptc)·H2 O] double layers with bpee. Complex7 possessed a 3D bcu-x net with 4-connected (7 4 ·8 2 ) topology, yielded by linking the 4, 4′-bipy with left- and right-handed [Ni4 (α-bptc)(OH)4 ·4H2 O] helical chains. Magnetic susceptibility measurements indicated the ferromagnetic behaviours of complex7 .