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A new three‐dimensional coordination polymer of Sr II based on dipicolinic acid, with different coordination environments for Sr II
Author(s) -
Soleimannejad Janet,
Derikvand Zohreh,
Koleiae Farzaneh
Publication year - 2014
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229614009668
Subject(s) - dipicolinic acid , deprotonation , square antiprism , crystallography , chemistry , molecule , ligand (biochemistry) , coordination polymer , metal , coordination complex , hydrothermal circulation , stereochemistry , crystal structure , ion , geology , paleontology , biochemistry , receptor , spore , organic chemistry , seismology , oxygen atom
A three‐dimensional coordination polymer of Sr II based on dipicolinic acid (pydcH 2 ) has been synthesized and characterized, namely poly[[diaquabis(μ 3 ‐6‐carboxypyridine‐2‐carboxylato)bis(μ 4 ‐pyridine‐2,6‐dicarboxylato)tristrontium(II)] dihydrate], {[Sr 3 (C 7 H 3 NO 4 ) 2 (C 7 H 4 NO 4 ) 2 (H 2 O) 2 ]·2H 2 O} 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 μ 3 ‐ and μ 4 ‐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.