Crystal structures,luminescent properties and Hirshfeld surface analyses of three cadmium(Ⅱ)complexes based on 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate
We have successfully synthesized three cadmium(Ⅱ)complexes[Cd(Hppb)2Br2](1),[Cd2(ppb)2Br2](2)and[Cd(Hppb)Br2]n(3)in which the bromide ions are involved based on an asymmetric ligand 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)benzoate(Hppb).Employment of different synthetic conditions has resulted in different architectures.In the three complexes,the ratios of Cd(Ⅱ)ions,ligands,and bromide ions were 1∶2∶2,1∶1∶1,and 1∶1∶2,respec-tively,resulting in different structures of mononuclear(0D),binuclear(0D),and 1D framework.The Cd(Ⅱ)coordinat-ed environments in 1 are slightly distorted octahedral geometries,but central ions in 2 and 3 display distorted square pyramidal geometries.There are obvious differences in the ligation modes of the ppb-or Hppb ligands for both complexes.In 1,two Hppb ligands display μ1-κN,N'coordination modes.In 2,two ppb-ligands display μ2-κN,N'∶κO coordination modes.Two ppb-ligands act as two µ1.1-bridges linking the binuclear Cd(Ⅱ)cations with a distance of 0.409 1(4)nm.In 3,the neutral Hppb ligands exhibit a µ2-κN,N'∶κO coordination mode,and connecting Cd(Ⅱ)ions by μ1.6-bridges and forming an infinite 1D chain along the b-axis.The complexes were both studied using Hirshfeld surface analyses and 2D fingerprint plots.Moreover,the photoluminescent properties of 1-3 indicate that the coordination anions make a great contribution to the fluorescent emission of Cd(Ⅱ)polymers.CCDC:2302311,1;2302312,2;2302313,3.
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