Oxygen-Bridged Transition Metal Chelates with Alkali & Alkaline Earth Metal Salts

Abstract

Oxygen-bridged transition metal chelates are an important category of coordination compounds that are used in a variety of applications in catalysis, materials science and biological systems. This paper examines the synthesis, characterization and properties of oxygen bridged transition metal complexes in combination with alkali and alkaline earth metal salts. The study will focus on the structural changes, stability values, and possible uses of these heterometallic systems. To characterize compounds synthesized, a systematic approach by using spectroscopic techniques such as UV-Visible, FTIR, NMR, and thermal analysis were used. The hypothesis was that on incorporation of the alkali and alkaline earth metals the stability would increase and the electronic property of the transition metal chelates would be altered due to oxygen bridging. The findings indicated that there were substantial differences in stability constants, calcium and magnesium salts exhibited a higher level of coordination than sodium and potassium counterparts. The resulting complexes that were produced had changed spectroscopic characteristics and had higher thermal stability. It was discussed that the character of alkali and alkaline earth metals has a considerable impact on the bridging geometry and the stability as a whole of complexes. The paper finds that oxygen-bridged heterometallic chelates have a potential of providing a future development of high-dual-function materials.