Crystal structure of tetraaqua-2,2'-bipyridinemanganese(II) 4-(sulfonylglycine) benzoic acid, [Mn(H2O)4(C10H8N2)][C10H7NO6S]

Abstract

Source of material DiscussionThe rational design and synthesis of new extended supramolecular networks are of great interest and have brought forth diversities of frameworks with fascinating structural motifs [1][2][3][4][5]. In general, the metallosupramolecular systems may display avariety of useful physicochemical properties and thus potential applications in the scopes of catalysis, molecular recognition, etc. So far many infinite 1D, 2D and 3D supramolecular frameworks have accomplished. Their primary structural motifs are dominated by metal-ligand coordinative bonds, and in this context, the design of suitable organic ligands is of the most importance. Beyond the robust metal-ligand coordination, other non-covalent bonding forces have also been proven to be powerful tools for the fine-tuning of functional architectures [6][7][8][9]. These weak secondary interactions, such as hydrogen bonds, π-π stacking and van der Waals forces, make the molecular assembly reversible and variable, and provide synthetic flexibility and functional diversity. On the other hand, the metal carboxylates have been shown to be an important family of MOFs, and have continuously received great attention for decades due to their excellent coordination capability and the possibility to synthesize new functional materials [10][11][12][13][14][15][16]. Compared to other carboxylate ligands, 4-(sulfonyl-glycine)benzoic acid does not only contain two bridging carboxylate moieties but possess another two potential groups, i. e., the nitrogen atoms and oxygen atoms of sulfonate. This asymmetric geometry may produce unique structural motifs with beautiful aesthetics and useful functional properties. It can act not only as ahydrogen bond acceptor but also as ahydrogen bond donor, depending upon the degree of deprotonation. The title crystal structure comprises a[Mn(bipy) (H 2 O) 4 ] 2+ cation and a HL 2-dianion in an asymmetric unit. The Mn(II) ion is six-Z. Kristallogr.