Coordination Assemblies of CoII/NiII/ ZnII/CdII with Succinic Acid and Bent Connectors: Structural Diversity and Spin-Canted Antiferromagnetism
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posted on 2012-04-04, 00:00 authored by Fu-Ping Huang, Qian Zhang, Qing Yu, He-Dong Bian, Hong Liang, Shi-Ping Yan, Dai-Zheng Liao, Peng ChengFour bent ligands, (i) 4,4′-abpt, (ii) 4,4′-Hbpt,
(iii) 3,4′-Hbpt, and (iv) 3,3′-Hbpt, as well as H2suc (succinic acid) have been utilized to construct seven
coordination polymers: [Co(suc)(4,4′-abpt)(H2O)2]·H2O (1), [M(suc)(4,4′-Hbpt)(H2O)]·2H2O (M = Co for 2, Ni for 3), [Cd(suc)(4,4′-Hbpt)2(H2O)2] (4), [Co(suc)(3,4′-Hbpt)(H2O)3]·H2O (5), [Zn(suc)(3,4′-Hbpt)]
(6), and [Zn(suc)0.5(3,3′-bpt)(H2O)] (7) (4,4′-abpt = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole,
4,4′-Hbpt = 1H-3,5-bis(4-pyridyl)-1,2,4-triazole,
3,4'-Hbpt = 1H-3-(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole,
and 3,3′-Hbpt = 1H-3,5-bis(3-pyridyl)-1,2,4-triazole).
The crystal structure analysis reveals that 1–3 form similar two-dimensional (2D) layer structures, where
the adjacent metal centers are connected by a syn–anti carboxylate bridge from suc ligands to furnish a succinate-metal
chain, which is further interlinked by bent ligands. 4–7 form different 1D chains via suc anions, and bpt isomers display versatile coordination modes.
The magnetic behavior of compounds 1–3 and 5 was studied, and it indicated the existence of
interesting spin-canting behavior, where the bent ligands tilting
the neighbor metal center could give further contribution to the canting
effect. In addition, the luminescent properties of 4, 6, and 7 have been investigated in the solid
state at room temperature.
