| Description: | [DCS seminar] Mr.Sashi Bhushan Sinha (Yale University,New Haven, CT, USA) -- A Stable Rh(IV) Complex and a Novel Series of Ligands Derived From an Oxidation-Resistant Pyridine Alkoxide Ligand. |
| Date: | Wednesday, Dec 30, 2015 |
| Time: | 3 p.m. - 5 p.m. |
| Venue: | G08, Lecture Hall Complex |
| Details: | Interest in high oxidation state transition-metal complexes has grown considerably in recent years in connection with oxidation catalysis. While there are a number of well-established Ir(IV) complexes, the highest oxidation state commonly encountered for rhodium is Rh(III). We have prepared and characterized mer-[RhIII(pyalk)3] (pyalk = 2-(2-pyridyl)-2-propanoate), a rhodium coordination complex capable of accessing the rare Rh(IV) oxidation state through both chemical and electrochemical oxidation. In contrast to the previously known Rh(IV) coordination complexes, mer-[RhIV(pyalk)3] is stable for long periods in a range of solvents, even water. This facilitates characterization by several methods including unprecedented Xray crystallography and EPR spectroscopy for the Rh(IV) state. The unprecedented stability of the Rh(IV) species is ascribed to the exceptional donor strength of the ligands, their oxidation-resistance and the meridional coordination geometry. The design of compounds having a bimetallic core with redox tunable metal centers is highly desired. Developing catalysts for selective bond forming and cleaving processes is a major topic in organometallic chemistry; this can be achieved economically through the design of complexes containing abundant and cheap 1st row transition metals. We have synthesized an oxidation resistant binucleating ligand for exploring metals in higher oxidation states as well forming multimetallic complexes, ideally to favor small molecule activation chemistry. |
| Calendar: | Seminar Calendar (entered by arun.ds) |