Two Preparation Methods-dominated Cdn-Based Coordination Polymers with Mixed Adenine Nucleobase and 5-Nitroisophathalate Ligands: Synthesis, Structure and Fluorescence

摘要

Two new Cdn-based coordination polymers (CPs) with mixed adenine (Hade) nucleobase and 5-nitroisophathalate (nip) ligands,{[Cd(Hade)0.5(H2O)2(nip)]·H2O}n 1 and {[Cd(Hade)(H2O)1.25(CH3OH)0.75(nip)]·O.75CH3OH·O.5H2O}n 2,were successfully obtained by varying the preparation methods and structurally characterized.Crystal data for 1:monoclinic,C2/c space group with a =10.5546(6),b =17.3496(6),c =16.1198(9) (A),β =104.2800(10)°,V =2860.6(2) (A)3,Dc =2.058 g/cm3,Mr =443.13,Z=8,F(000) =1752,μ =1.585 mm-1,the final R =0.0394 and wR =0.1109 for 2285 observed reflections with I ＞ 2σ(I).For 2:triclinic,P(I) space group with a =10.2032(7),b =10.5098(8),c =11.0223(8) (A),a =65.7050(10)°,β =74.5750(10)°,γ=61.5280(10)°,V=943.38(12) (A)3,Dc =1.888 g/cm3,Mr =536.24,Z =2,F(000) =537,μ =1.225 mm-1,the final R =0.0225 and wR =0.0702 for 3143 observed reflections with I ＞ 2σ(I).1 presents a crisscrossed layer with mutually orthogonal {Cd(nip)} chains aggregated by neutralμ-N(7),N(9)-Hade connector.By contrast,2 displays a linear chain with CdⅡ ions extended by bis-bidentate chelating-nip2-connectors,which are further assembled into a broad ribbon by N-H…N hydrogen-bonding interactions.Additionally,the two solid-state samples with comparable thermal stability exhibit favorable luminescent emissions at room temperature,suggesting their potential applications as fluorescence materials.