Abstract
In the crystal of the title polymeric complex, {[CoCa(C7H3NO4)2(H2O)4]·2H2O} n (1), the CoII ion is N,O,O'-chelated by two pyridine-2,6-di-carboxyl-ate anions in a distorted N2O4 octa-hedral geometry, and two carboxyl-ate O atoms of pyridine-2,6-di-carboxyl-ate anions bridge tetra-aqua-calcium(II) units to form polymeric chains propagating along the b-axis direction. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds, and offset π-π stacking inter-actions [inter-centroid distances = 3.551 (1) and 3.746 (1) Å] involving inversion-related pyridine rings link the polymeric chains and lattice water mol-ecules to form a supra-molecular three-dimensional framework.
Highlights
In the crystal of the title polymeric complex, {[CoCa(C7H3NO4)2(H2O)4]Á2H2O}n (1), the CoII ion is N,O,O0-chelated by two pyridine-2,6-dicarboxylate anions in a distorted N2O4 octahedral geometry, and two carboxylate O atoms of pyridine-2,6-dicarboxylate anions bridge tetraaquacalcium(II) units to form polymeric chains propagating along the b-axis direction
According to our earlier study (Sun et al, 2016), heterometallic complexes containing both alkaline earth metals and d-block transition metals are available because the former are structurally malleable and they have a strong affinity to O atoms rather than N atoms (Cao et al, 2015; Yu et al, 2013), and the latter have a strong tendency to coordinate to both N- and O-atom donors (Hu et al, 2013; Zhang et al, 2013)
As a part of our ongoing studies on heterometallic frameworks, we describe here the synthesis and crystal structure of the title complex,1
Summary
The controllable synthesis of heterometallic polymers, with their fascinating structures and outstanding properties, is still a challenge in crystal engineering (Cai et al, 2012; Ma et al, 2014; Sun et al, 2014; Ward, 2007). According to our earlier study (Sun et al, 2016), heterometallic complexes containing both alkaline earth metals and d-block transition metals are available because the former are structurally malleable and they have a strong affinity to O atoms rather than N atoms (Cao et al, 2015; Yu et al, 2013), and the latter have a strong tendency to coordinate to both N- and O-atom donors (Hu et al, 2013; Zhang et al, 2013). The O and N atoms in these ligands made them easy to chelate or bridge metal ions They can be completely or partially deprotonated to generate HpdcÀ or pyc2À, displaying a variety of coordination modes. As a part of our ongoing studies on heterometallic frameworks, we describe here the synthesis and crystal structure of the title complex,
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