Synthesis and characterization of some metal complexes of a proton transfer salt, and their inhibition studies on carbonic anhydrase isozymes and the evaluation of the results by statistical analysis

Abstract

A novel proton transfer compound (HMeOABT) ⁺ (HDPC)⁻ (1) and its Fe(III), Co(II), Ni(II) and Cu(II) complexes (2–5) have been prepared and characterized by spectroscopic techniques. Complex 4 has distorted octahedral conformation revealed by single crystal X-ray diffraction method. Structures of the other complexes might be proposed as octahedral according to experimental data. All compounds were also evaluated for their in vitro inhibition effects on hCA I and II for their hydratase and esterase activities. Although there is no inhibition for hydratase activities, all compounds have inhibited the esterase activities of hCA I and II. Data have been analyzed by using a one-way analysis of variance. The comparison of the inhibition studies of 1–5 to parent compounds indicates that 1–5 have superior inhibitory effects. The inhibition effects of 2–5 are also compared to inhibitory properties of the metal complexes of MeOABT and H2DPC, revealing an improved transfection profile.

• 2-Amino-6-methoxybenzothiazole
• carbonic anhydrase
• inhibition
• proton transfer
• 2,6-pyridinedicarboxylic acid

Acknowledgements

In addition, the authors would like to thank the Medicinal Plants and Medicine Research Center of Anadolu University, for allowing us to use the X-ray facility.

Supplementary material available online Supplementary Tables S1–S4 Supplementary Figures S1–S8.