Crystal Structure and Luminescent Properties of a 3D Cd(Ⅱ) Compound Constructed from Succinate and 3,6-Di(4-pyridyl)pyridazine

摘要

A three-dimensional (3D) coordination polymer,[Cd(SC)(DPPD)]n (1,H2SC =succinic acid and DPPD =3,6-di(4-pyridyl)pyridazine),has been synthesized by the solvothermal reaction of Cd(NO3)2·4H2O with H2SC and DPPD at 120 ℃ in DMF solvent.Compound 1 crystallizes in the monoclinic system,space group P21/c,with a =10.7993(4),b =11.7705(3),c =13.5336(6) (A),V =1678.89(11) (A)3,Z =4,C18H14N4O4Cd,Mr=462.73,Dc=1.831 g/cm3,μ =1.335 mm-1,F(000) =920.0,the final R =0.0500 and wR =0.1567 for 3714 observed reflections with Ⅰ＞ 2σ(Ⅰ).In compound 1,the Cd(Ⅱ) ions are linked by the SC2-ligands to give a two-dimensional (2D) undulating sheet based on the centrosymmetric dinuclear Cd2(COO)2 units.The 2D sheets are further connected by the DPPD ligands to produce a 3D structure,which is a 6-connected (44·6·10·8) topological network based on the dinuclear Cd2(COO)2 node.Compound 1 exhibits a photoluminescent emission with a maximum at 540 nm upon excitation at 460 nm.