title: A new three-dimensional coordination polymer of Sr(II) based on dipicolinic acid, with different coordination environments for Sr(II).
abstract: A three-dimensional coordination polymer of Sr(II) based on dipicolinic acid (pydcH2) has been synthesized and characterized, namely poly[[diaquabis(μ3-6-carboxypyridine-2-carboxylato)bis(μ4-pyridine-2,6-dicarboxylato)tristrontium(II)] dihydrate], {[Sr3(C7H3NO4)2(C7H4NO4)2(H2O)2]·2H2O}n. The asymmetric unit consists of two unique Sr(II) centres (one of them situated on an inversion centre), two independent pydc(2-) ligands, and one coordinated and one uncoordinated water molecule. The two independent Sr(II) cations are surrounded by water and dipicolinate molecules in distorted square-antiprism and distorted tricapped trigonal prismatic geometries. The dipicolinate ligands adopt μ3- and μ4-bridging modes, linking the alkaline earth metal centres into a three-dimensional coordination framework. One dipicolinate ligand is doubly deprotonated, while the other is singly deprotonated.
authors.affiliation: School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
authors.forename: Janet
authors.initials: J
authors.lastname: Soleimannejad
authors.affiliation: Department of Chemistry, Faculty of Sciences, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran.
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Derikvand
authors.affiliation: Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran.
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Koleiae
keywords: crystal structure; dipicolinic acid; strontium(II) complex; three-dimensional coordination polymer