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Five novel SrII-LnIIIheterometallic coordination polymers based on pyridine-2,6-dicarboxylic acid(H2pda)and imidazole(im),namely,[LnSr(pda)3(H2O)5]·Him·C2H5OH·3H2O(Ln=Nd(1);Pr(2)),[Ln2Sr(pda)6(H2O)5]·4Him·C2H5OH·5H2O(Ln=Nd(3)