Synthesis and Structural Study of Pyridinium Complexes{[Zn(L)Cl2]·4H2O}
A Zn(Ⅱ)complex,{[Zn(L)Cl2]·4H2O},was successfully constructed by using a semi rigid pyridinium polycarboxylic acid ligand 1,1'-([1,1'-biphenyl]-4,4'-diylbis(methylene))bis(4-carboxypyridin-1-ium)(H2LCl)as a linker and reacting with Zn2+ ions under hydrothermal conditions at 120℃for 72 hours.Through X-ray single crystal diffraction analysis,it was found that{[Zn(L)Cl2]·4H2O}is a one-dimensional chain structure,belonging to a monoclinic system.The P21/c space group(cell parameters a=15.951(6)Ẳ,b=9.636(4)Ẳ,c=18.849(7)Ẳ,α=90°,β=113.240(6)°,γ=90°).The Zn(II)center connects two carboxyl oxygen atoms and two Cl-ions in a four coordinated mode to form a slightly twisted tetrahedral configuration.In the complex,the H2LCl ligand contains a rotating-CH2-group and a biphenyl structure.The-CH2-group causes the two pyridine rings to be not in the same plane as the biphenyl ring,and the direction of the two pyridine rings is opposite,resulting in a"Z"shaped structure of the ligand,which is more conducive to the ligand's participation in coordination.In addition,the π conjugated structure in biphenyls not only allows each one-dimensional chain like complex to further form three-dimensional supramolecules through π-π stacking,but also increases its structural stability.
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