No abstract

No abstract

Funding informationCNPq, CAPES and FAPEMIG The reactions of R 3 SnCl (R = Me, Bu or Ph) with sodium 4-phenylbutyrate, Na(OPh b ), in EtOH yielded three polymeric triorganotin carboxylates, namely [R 3 Sn(OPh b )] n (R = Me (1), Bu (2) or Ph (3)). All complexes were spectroscopically characterized using Fourier transform infrared, 119 Sn Mössbauer, 1 H NMR, 13 C{ 1 H} NMR and 119 Sn{ 1 H} NMR spectral techniques. In addition, the crystal structures of 1 and 3 were determined using single-crystal X-ray diffraction. Their polymeric structures are sustained by bridging carboxylates which connect two five-coordinate Sn(IV) centres. Each metallic cation displays a distorted trigonal bipyramidal coordination geometry (Addison's parameters ranging from 0.84 in 1 to 0.77-0.91 in 3), with the oxygen atoms occupying the apical positions and the organic groups at the equatorial corners. The one-dimensional zigzag chains of 1 propagate along the b-axis, whereas 3 displays wave-like double polymeric chains along the b-axis. For both 1 and 3, parallel one-dimensional polymeric chains are interconnected by C─H⋅⋅⋅π interactions. The antifungal activity of 1-3 was screened against Candida albicans (ATCC 18804), C. tropicalis (ATCC 750), C. glabrata (ATCC 90030), C. parapsilosis (ATCC 22019), C. lusitaniae (CBS 6936) and C. dubliniensis (clinical isolate 28). The antifungal activity of 3 was noteworthy since it was not only more active than 1 and 2, but also more active than the control drugs (nystatin and fluconazole nitrate) in some cases.

In the present work, the two‐dimensional (2D) polymer poly[[μ4‐2‐(4‐nitrobenzenesulfonamido)benzoato‐κ4O1:O1:O1′:N6]silver(I)] (AgL), [Ag(C13H9N2O6S)]n, was obtained from 2‐(4‐nitrobenzenesulfonamido)benzoic acid (HL), C13H10N2O6S. FT–IR, 1H and 13C{1H} NMR spectroscopic analyses were used to characterize both compounds. The crystal structures of HL and AgL were determined by single‐crystal X‐ray diffraction. In the structure of HL, O—H…O hydrogen bonds between neighbouring molecules result in the formation of dimers, while the silver(I) complex shows polymerization associated with the O atoms of three distinct deprotonated ligands (L−). Thus, the structure of the Ag complex can be considered as a coordination polymer consisting of a one‐dimensional linear chain, constructed by carboxylate bridging groups, running parallel to the b axis. Neighbouring polymeric chains are further bridged by Ag—C monohapto contacts, resulting in a 2D framework. Fingerprint analysis of the Hirshfeld surfaces show that O…H/H…O hydrogen bonds are responsible for the most significant contacts in the crystal packing of HL and AgL, followed by the H…H and O…C/C…O interactions. The Ag…Ag, Ag…O/O…Ag and Ag…C/C…Ag interactions in the Hirshfeld surface represent 12.1% of the total interactions in the crystal packing. Studies of the interactions of the compounds with human serum albumin (HSA) indicated that both HL and AgL interact with HSA.