@article { ISI:000306280700023,
	title = {Encapsulation of enzyme in large mesoporous material with small mesoporous windows},
	journal = {Chemical Communications},
	volume = {48},
	number = {63},
	year = {2012},
	month = {JUN},
	pages = {7853-7855},
	publisher = {ROYAL SOC CHEMISTRY},
	type = {Article},
	address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND},
	abstract = {<p>Trypsin has been encapsulated in the mesopores of a hierarchical mesoporous silica material synthesized via Cu(I) catalyzed azide-alkyne click reaction between azide functionalized large spherical SBA-15 particles and alkyne functionalized mesoporous silica nanoparticles (MSNs). Encapsulated trypsin functions as an efficient biocatalyst and can be recycled several times.</p>},
	issn = {1359-7345},
	doi = {10.1039/c2cc33592a},
	author = {Malvi, Bharmana and Sen Gupta, Sayam}
}
@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 {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}
}
@article {48018,
	title = {Electrocatalytic alcohol oxidation by a molecular iron complex},
	journal = {Faraday Discussions},
	volume = {234},
	year = {2022},
	month = {MAY},
	pages = {42-57},
	type = {Article},
	abstract = {<p>
	An efficient electrochemical method for the selective oxidation of alcohols to their corresponding aldehydes/ketones using a biomimetic iron complex, [(bTAML)Fe-III-OH2](-), as the redox mediator in an undivided electrochemical cell with inexpensive carbon and nickel electrodes using water as an oxygen source is reported. The substrate scope also includes alcohols that contain O and N heteroatoms in the scaffold, which are well tolerated under these reaction conditions. Mechanistic studies show the involvement of a high-valent Fe-V(O) species, [(bTAML)Fe-V(O)](-), formed via PCET (overall 2H(+)/2e(-)) from [(bTAML)Fe-III-OH2](-) at 0.77 V (vs. Fc(+)/Fc). Moreover, electrokinetic studies of the oxidation of C-H bonds indicate a second-order reaction, with the C-H abstraction by Fe-V(O) being the rate-determining step. The overall mechanism, studied using linear free energy relationships and radical clocks, indicates a {\textquoteleft}{\textquoteleft}net hydride{\textquoteright}{\textquoteright} transfer, leading to the oxidation of the alcohol to the corresponding aldehyde or ketone. When the reaction was carried out at pH \&gt; 11, the reaction could be carried out at a similar to 500 mV lower potential than that at pH 8, albeit with reduced reaction rates. The reactive intermediate involved at pH \&gt; 11 is the corresponding one-electron oxidized [(bTAML)Fe-IV(O)](2-) species.</p>
},
	issn = {1359-6640},
	doi = {10.1039/d1fd00074h},
	author = {Kuiry, Himangshu and Das, Debasree and Das, Soumadip and Chakraborty, Soham and Chandra, Bittu and Sen Gupta, Sayam}
}
