Crystal structure of tetraaqua(2,2′-bipyridyl-N,N′)zinc(II) – di-μ-aquabis[ aqua(2,2′-bipyridyl-N,N′)-(5-sulfoisophthalato)zinc(II)] tetrahydrate, Zn(H2O)4(C10H8N2) · Zn2(H2O)4(C10H8N2)2(C8H3SO7)2 · 4H2O

Abstract

Source of materialAmixture of 5-sulfoisophthalic acid monosodium salt (NaHSIP; 0.027 g, 0.1 mmol), Zn(CH 3 COO) 2 (0.019 g, 0.1 mmol), 2,2'-bipyridine (bipy, 0.016 g0.1 mmol), and H 2 O(10 mL) was stirred for about 30 min. Experimental detailsThe C-bound Ha toms were geometrically placed (d(C-H) = 0.93 Å)and refined as riding with U iso (H) =1.2 U eq (C). The Obound Ha toms were located in difference maps and refined as riding in their as-found relative positions with U iso(H) =1 .2 U eq (O). DiscussionThe chemistry of 1,3,5-benzenetricarboxylic acid (BTC) has been extensively studied as abuilding block for extended coordination solids owing to its high symmetry and coordination preferences for ab road range of metal ions [1][2][3][4][5]. 5-Sulfoisophthalic acid (H 2 SIP), being astructural analogue of BTC, could be expected also to construct metal organic frameworks. 2+ .The asymmetric unit contains two symmetrically independent Zn atoms. The coordination environment of the Zn1 atom consists of an octahedron, with the basal plane defined by two bipyridine Na toms of a2 ,2'-bipy ligand, one carboxylate oxygen and one bridging water molecule. The remaining two sites are occupied by two coordinated water molecules. Zn2 center coordinates to two symmetry related pyridine N atoms of a2 ,2'-bipyridine molecule and four symmetry related oxygen atoms of aqua ligands. Two bipyridine Natoms and two coordinated water molecules form the basal plane, and the remaining coordinated water molecules occupy the axial positions. The Zn-Ndistances range from 2.092(2) Å to 2.161(2) Å,and Zn-Obond distance is in the range of 2.0311(2) -2.267(2) Å, which is consistent with those found in comparable structures [8]. The SIP ligand adopts an O-monodentate mode, which is different from those found in in comparable structures [7][8][9][10]