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用水热方法合成了两个新的配位聚合物[Co(trza)](1)和[Ni(trza)(H2O)2](2)(Htrza=4H-1,2,4-三氮唑-4-乙酸)。单晶X-射线衍射结构分析表明:化合物1和2具有二维(2D)层状结构。在1中,Co(II)离子采用六配位方式,分别与来自两个不同配体(trza)上的两个氮原子和四个羧基氧原子配位,形成八面体配位聚合物,每个羧基以二齿桥联方式连接两个Co原子,形成1D链,这些一维链进一步与唑环上的N原子形成2D层状结构。在2中,中心Ni(II)离子采用同样的配位模式形成八面体配位聚合物,与1不同的是:来自两个配体阴离子(trza)上的两个羧基氧原子分别被两个配位水分子所取代,且配体上的羧基氧原子采用的是单齿配位模式。化合物1的变温磁化率测定表明了金属间弱的反铁磁相互作用。此外,两个配位聚合物的IR光谱、热稳定性以及化合物1的磁性质也被测定。
Two novel coordination polymers [Co (trza)] (1) and [Ni (trza) (H2O) 2] (2) were synthesized by the hydrothermal method (Htrza = 4H-1,2,4-triazole -4-acetic acid). Single crystal X-ray diffraction structure analysis shows that compounds 1 and 2 have a two-dimensional (2D) layered structure. In 1, the Co (II) ions adopt a six-coordinate system and coordinate with two nitrogen atoms and four carboxyl oxygen atoms from two different trza ligands respectively to form an octahedral coordination polymer. Each A carboxyl group connects two Co atoms by a bidentate bridge to form a 1D chain, which further forms a 2D layered structure with N atoms on the oxazole ring. In 2, central Ni (II) ions adopt the same coordination mode to form octahedral coordination polymers, except that the two carboxyl oxygen atoms from the two ligand anions (trza) are replaced by two Coordination water molecules replaced, and the ligand of the carboxyl oxygen atoms using monodentate coordination mode. The temperature dependence of the magnetic susceptibility of compound 1 shows the weak antiferromagnetic interaction between metals. In addition, IR spectra of the two coordination polymers, thermal stability, and magnetic properties of Compound 1 were also determined.