新型4-羧酸-2,2′:6′,2″-联三吡啶配合物的合成、晶体结构与荧光性质

Synthesis,Crystal Structure and Fluorescence Properties of Novel 4-Carboxylic Acid-2,2′:6′,2″-Terpyridine Complexes

用乙酸锌、4-羧酸-2,2′:6′,2″-联三吡啶和草酸在水热法条件下反应生成新的配合物1,结构式为[Zn_3(tpy)_2(C_2O_4)_2(H_2O)_4]·(H_2O)(tpy=4-羧酸-2,2′:6′,2″-联三吡啶).X-射线单晶衍射测定配合物1,该单晶属于单斜晶系,2/m点群,P2_1/c空间群,晶胞参数为:a=8.8197(13),b=23.462(3),c=10.0674(14),α=90°,β=113.49°,γ=90°.配合物1是三核配合物.中心锌离子Zn1是六配位,其中3个Zn1-N键长分别是2.186(4)、2.083(3)、2.172(5),3个Zn1-O键长分别是2.230(3)、2.027(3)、2.048(4).锌离子Zn2是对称六配位,键长分别是2.1223(3)、2.0597(5)、2.1416(4).配合物1分子通过氢键和π-π堆积作用形成三维超分子结构.对配合物1进行荧光及热稳定性的研究表明,配合物1具有很好的稳定性,并具有一定的荧光性.

A new complex1,of which the formula[[Zn3(tpy)2(C2O4)2(H2O)4]·(H2O)(tpy=4-carboxylic acid-2,2′:6′,2″-terpyridine),is was prepared by the reaction of zinc acetate,4-carboxylic acid-2,2′:6′,2″-terpyridine and oxalic acid under hydrothermal conditions.The single crystal belongs to the monoclinic system,the2/m point group,the P21/c space group,the unit cell parameters are:a=8.8197(13),b=23.462(3),c=0.0674(14),α=90°,β=113.49°,γ=90°.Complex1is a trinuclear complex.Three Zn1-N bond length are2.186(4),2.083(3),2.172(5),and the three Zn1-O bond lengths are2.230(3),2.027(3),2.048(4).Zinc ion Zn2is symmetrical hexa,the bond length are2.1223(3),2.0597(5),2.1416(4).The complex1molecule forms a three-dimensional supramolecular structure by hydrogen bonding andπ-πstacking.The study of fluorescence and thermal stability of complex1shows that complex1is stable and has a certain fluorescence.