Crystal structure of tetraaqua(2,2′-bipyridyl-N,N′)cobalt(II) di-μ-aqua-bis[aqua(2,2′bipyridyl-N,N′)-(5-sulfoisophthalato)cobalt(II)] tetrahydrate, Co(H2O)4(C10H8N2) · Co2(H2O)4(C10H8N2)2(C8H3SO7)2 ·4H2O

Abstract

Source of materialAm ixture of 5-sulfoisophthalic acid monosodium salt (SIP, 0.027 g, 0.1 mmol), Co(CH 3 COO) 2 (0.018 g, 0.1 mmol), 2,2'-bipyridine (2,2'-bipy, 0.016 g, 0.1 mmol) and H 2O( 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 Hatoms were located in difference Fourier maps and refined as riding in their as-found relative positions with U iso(H) = 1.2 U eq (O). The high R value is caused by the low quality of the crystal. DiscussionThe rational design and synthesis of metal-directed supramolecular framework is of great current interest due to their potential application in the catalysis, gas absorption, nonlinear optics, ionexchange, and so on [1-4]. 5-Sulfoisophthalic acid (SIP), containing two kinds of coordinating functional groups and multiple coordination sites, is ag ood ligand for the construction of metalorganic frameworks [5][6][7][8][9][10][11][12]. The title compound possesses acrystal structure constructed from Co ions and SIP anions and 2,2'-bipy ligands. The asymmetric unit contains two Co(II) atoms. Each Co center has distorted octahedral coordination. The coordination of Co1 is defined by two nitrogen atoms of the 2,2'-bipy ligand, one carboxylate oxygen donor and one bridging aqua ligand at the equatorial positions. The axial positions are occupied by one terminal water molecule and one bridging water molecule. The Co2 center is located on the twofold rotation axis and coordinated by two nitrogen atoms from 2,2'-bipy ligand and four terminal water molecules. Two nitrogen atoms and two terminal water molecules form the equatorial plane and the remaining coordinated water molecules occupy the axial positions. The Co-Ob ond lengths are in the range of 2.058 (4) 2+ cations serve for the charge balance. The complex cations and anions align in alternating mode, which is made possible by the well-matched ionic size, and interact with each other via hydrogen bonds between the sulfonate groups and the coordinated water molecules, resulting in the formation of infinite Z. Kristallogr.