@article {43638,
	title = {Electrocatalytic water oxidation by a molecular cobalt complex through a high valent cobalt oxo intermediate},
	journal = {Chemical Communications},
	volume = {52},
	year = {2016},
	month = {AUG},
	pages = {11787-11790},
	abstract = {Biuret-modified tetraamidomacrocyclic cobalt complex [Co-III-bTAML]- is shown to catalyze electrochemical water oxidation at basic pH leading to the formation of O-2. Electrochemical and spectroscopic studies indicate a high valent cobalt oxo intermediate isoelectronic to Co-V(O) as the active oxidant. The kinetic isotope effect of 8.63 indicates an atom proton transfer mechanism.},
	doi = {10.1039/c6cc05773j},
	author = {Das, Debasree and Pattanayak, Santanu and Singh, Kundan K. and Garai, Bikash and Sen Gupta, Sayam}
}
@article { ISI:000366864700011,
	title = {Employing carboxylic acids in aryne multicomponent coupling triggered by aziridines/azetidines},
	journal = {Organic Chemistry Frontiers},
	volume = {3},
	number = {1},
	year = {2016},
	month = {NOV},
	pages = {71-76},
	publisher = {CHINESE CHEMICAL SOC},
	address = {PO BOX 1-18, NANKANG, TAIPEI 115, TAIWAN},
	abstract = {<p>The transition-metal-free aryne multicomponent coupling (MCC) involving carboxylic acids initiated by aziridines/azetidines has been reported. The use of aziridines as nucleophiles afforded N-aryl beta-amino alcohol derivatives and the application of azetidines as nucleophilic triggers furnished N-aryl gamma-amino alcohol derivatives in moderate to good yields. These reactions proceed under mild conditions and result in the formation of a new carbon-nitrogen bond and a new carbon-oxygen bond. The utility of carboxylic acids in aryne MCCs has been demonstrated, and the synthetic potential of phenols as acid surrogates in the present aryne MCCs has been realized.</p>},
	issn = {2052-4129},
	doi = {10.1039/c5qo00328h},
	author = {Roy, Tony and Bhojgude, Sachin Suresh and Kaicharla, Trinadh and Thangaraj, Manikandan and Garai, Bikash and Biju, Akkattu T.}
}
@article {43549,
	title = {Electrochemical formation of Fe-V (O) and mechanism of its reaction with water during O-O bond formation},
	journal = {Chemistry-A European Journal},
	volume = {23 },
	year = {2017},
	month = {MAR},
	pages = {3414-3424},
	type = {Journal Article},
	abstract = {A detailed electrochemical investigation of a series of iron complexes (biuret-modified tetraamido iron macrocycles FeIII-bTAML), including the first electrochemical generation of Fe-V(O), and demonstration of their efficacy as homogeneous catalysts for electrochemical water oxidation (WO) in aqueous medium are reported. Spectroelectrochemical and mass spectral studies indicated FeV(O) as the active oxidant, formed due to two redox transitions, which were assigned as Fe-IV(O)/Fe-III(OH2)and Fe-V(O)/Fe-IV(O). The spectral properties of both of these high-valent iron oxo species perfectly match those of their chemically synthesised versions, which were thoroughly characterised by several spectroscopic techniques. The O-O bond-formation step occurs by nucleophilic attack of H2O on FeV(O). A kinetic isotope effect of 3.2 indicates an atom-proton transfer (APT) mechanism. The reaction of chemically synthesised Fe-V(O) in CH3CN and water was directly probed by electrochemistry and was found to be first-order in water. The pK(a) value of the buffer base plays a critical role in the rate-determining step by increasing the reaction rate several-fold. The electronic effect on redox potential, WO rates, and onset overpotential was studied by employing a series of iron complexes. The catalytic activity was enhanced by the presence of electron-withdrawing groups on the bTAML framework. Changing the substituents from OMe to NO2 resulted in an eightfold increase in reaction rate, while the overpotential increased threefold.},
	doi = {10.1002/chem.201605061},
	author = {Pattanayak, Santanu and Chowdhury, Debarati Roy and Garai, Bikash and Singh, Kundan K. and Paul, Amit and Dhar, Basab B. and Sen Gupta, Sayam}
}
