Crystal Structures,Luminescent Properties and Hirshfeld Surface Analyses of Zn(Ⅱ) and Cd(Ⅱ) Compounds Based on 1-(2-Carboxyl-phenyl)-3-(pyridin-2-yl)pyrazole

Two compounds,Zn_2(Hcppp)_2(cppp)_2(H_2O)_2]·2 NO_3·6 H_2O(1) and Cd(Hcppp)_2Cl_2]· 3H_2O(2)(Hcppp = 1-(2-carboxyl-phenyl)-3-(pyridin-2-yl)pyrazole),are synthesized and characterized by IR,TGA and X-ray single-crystal/powder diffraction.Compound 1 crystallizes in monoclinic system,space group P2_1/c with a = 9.894(2),b = 15.856(3),c = 20.430(4) ?,β = 101.70(3)°,V = 3138.5(11) ?~3,Z = 2,M_r = 1457.94,D_c = 1.543 g/cm~3,F(000) = 1504,R = 0.0278 and wR = 0.0749 for 6157 observed reflections(I 2σ(I)).Compound 2 crystallizes in triclinic system,space group P1 with a = 9.1424(4),b = 11.6427(5),c = 16.1345(7) ?,α = 102.6430(10)°,β = 95.4530(10)°,γ = 104.0060(10)°,V = 1605.94(12) ?~3,Z = 2,M_r = 767.88,D_c = 1.588 g/cm~3,F(000) = 776,R = 0.0307 and wR = 0.0764 for 6275 observed reflections(I 2σ(I)).Compound 1 exhibits a binuclear structure while compound 2 shows a mononuclear structure.In compound 1,two cppp-ligands display the μ_2-kN,N′:k O and two Hcppp ligands show the μ_1-kN,N′ coordination modes.However,two Hcppp ligands connect one Cd(Ⅱ) cation and exhibit the μ_1-kN,N′ binding mode in compound 2.The compounds are both studied using Hirshfeld surface analyses and 2D fingerprint plots.The luminescent properties are also discussed.