No abstract

No abstract

No abstract

Organotin mefenamic complexesÐpreparations, Organotin mefenamic complexesÐpreparations, spectroscopic studies and crystal structure of a spectroscopic studies and crystal structure of a triphenyltin ester of mefenamic acid: novel antitriphenyltin ester of mefenamic acid: novel antituberculosis agents tuberculosis agents C NMR spectroscopies. The crystal structure of 1 has been determined by X-ray crystallography. X-ray analysis revealed a pseudo-pentacoordinated structure containing Ph 3 Sn coordinated to the carboxylato group. The structural distortion is a displacement from the tetrahedron toward the trigonal bipyramid. Significant CÐH±p interactions and intramolecular hydrogen bonds stabilize the structure 1. The polar imino hydrogen atom participates in intramolecular hydrogen bonds. Complex 1 is self-assembled via CÐH±p and stacking interactions. Vibrational and NMR data are discussed in terms of the crystal structure and the proposed structures for 1±3. Compounds 1 and 3 were tested for antimycobacterial activity against Mycobacterium tuberculosis H37Rv.

The novel triphenyl adduct of 2‐[(2,6‐dimethylphenyl)amino]benzoic acid (HDMPA; 1), i.e., [SnPh3(DMPA)] (2), the dimeric tetraorganostannoxane [Ph2(DMPA)SnOSn(DMPA)Ph2]2 (3), and the monomeric adduct [SnPh2(DMPA)2] (4), where DMPA is monodeprotonated HDMPA, have been prepared and structurally characterized by means of IR, 1H‐NMR, and 13C‐NMR spectroscopy. The structures of 1 and 2 have been determined by X‐ray crystallography. Single‐crystal X‐ray‐diffraction analysis of 1 revealed that there are two molecules in the asymmetric unit, HD1 and HD2, differing in conformation, both forming centrosymmetric dimers linked by H‐bonds between the carboxylic O‐atoms. X‐Ray analysis of 2 revealed a pentacoordinate structure containing Ph3Sn coordinated to the carboxylato group. Significant CH/π interactions and intramolecular H‐bonds stabilize the structures of 1 and 2, which self‐assembled via CH/π and π/π‐stacking interactions. The Ph3Sn adduct 2 was found to be a promising antimycobacterial lead compound, displaying activity against Mycobacterium tuberculosis H37Rv. The cytotoxiciy in the Vero cell line is also reported.