冠醚配合物:[K(DB18C6)]_2[Co(NCS)_4]C_3H_6O的合成与结构研究

合成了二苯并18冠6冠醚配合物:[K（DB18C6）]2[Co（NCS）4]C3H6O,并通过元素分析、红外光谱及X-射线单晶衍射对结构进行了分析.配合物为:单斜晶系、空间群C2/C.晶体学数据:a=2.051（8）,b=1.517 4（7）,c=1.912 5（8）nm,β=92.422（8）°,V=5.927（4）nm3,Z=4,Dcalc=1.352 g·cm-3,F（000）=2 516,R1=0.061,wR=0.126 5.配合物由两个[K（DB18C6）]+配阳离子、一个[Co（NCS）4]2-配阴离子和一个C3H6O分子组成.四个硫氰酸根的氨原子与钴原子配位,[Co（NCS）4]2-为四面体构型.K+除与冠醚环6个氧原子成键外还与丙酮氧原子配位成键.

Syntheses and Characterizations of Novel One-dimensional Coordination Polymers Self-assembled from Co(NCS)_2 and Flexible Diester-bridged Pyridine-based Ligands

The self-assembly reactions of Co(NCS) 2 with diester-bridged pyridine-based ligands pyCO 2-(CH 2) m-O 2Cpy (py=4-pyridyl; m=2, 3, 4) have been studied. Interestingly, while Co^(NCS) 2 reacted with pyCO 2-(CH 2) 2-O 2Cpy (La) in MeOH/H 2O or THF/MeCN to yield two coordination polymers [Co^(NCS) 2(La) 2] n(1) and [Co(NCS) 2(La) 2·2THF] n(2), reactions of Co(NCS) 2 with pyCO 2-(CH 2) 3-O 2Cpy (Lb) in MeOH/MeCN and Co(NCS) 2 with pyCO 2-(CH 2) 4-O 2Cpy (Lc) in EtOH/H 2O afforded [Co(NCS) 2(Lb) 2· 0.5MeOH] n(3) and [Co(NCS) 2(Lc) 2·2H 2O] n(4), respectively. The X-ray diffraction analyses indicated that polymers 1-4 consist of a one-dimensional Co(II) chain in which each of the two adjacent Co(II) ions is bridged by two pyCO 2-(CH 2) m-O 2Cpy ligands to form a macrocycle. In addition, the structures of polymers 1-4 were also characterized by infrared spectroscopy, thermogravimetry and elemental analysis.