Mannar R. Maurya

Indian Institute of Technology Roorkee

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Fernando Avecilla

Universidade da Coruña

223

João Costa Pessoa

University of Lisbon

Isabel Correia

University of Lisbon

Naveen Kumar

University of Hyderabad

Sarita Dhaka

Chaudhary Charan Singh University

Puneet Gupta

Indian Institute of Technology Roorkee

Pedro Adão

Instituto Politécnico de Leiria

Dieter Rehder

Universität Hamburg

Rupam Dinda

National Institute of Technology Rourkela

Bithika Sarkar

Indian Institute of Technology Roorkee

Cooperative Institutions

Indian Institute of Technology Roorkee

Jamia Millia Islamia

National Institute of Technology Rourkela

Instituto Superior Técnico

Academy of Scientific and Innovative Research

National Chemical Laboratory

Indian Institute of Petroleum

Rede de Química e Tecnologia

Council of Scientific and Industrial Research

University of Lisbon

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

CCDC 831864: Experimental Crystal Structure Determination

The Cambridge Structural Database (2013)

Sagarika Pasayat Subhashree P. Dash Satabdi Roy Rupam Dinda Sarita Dhaka

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccwxmbq

Cite

Citations (0)

Polystyrene bound oxidovanadium(IV) and dioxidovanadium(V) complexes of histamine derived ligand for the oxidation of methyl phenyl sulfide, diphenyl sulfide and benzoin

Dalton Transactions (2009)

Mannar R. Maurya Aarti Arya Amit Kumar João Costa Pessoa

Ligand Hsal–his (I) derived from salicylaldehyde and histamine has been covalently bound to chloromethylated polystyrene cross-linked with 5% divinylbenzene. Upon treatment with [VO(acac)2] in DMF, the polystyrene-bound ligand (abbreviated as PS–Hsal–his, II) gave the stable polystyrene-bound oxidovanadium(IV) complex PS–[VIVO(sal–his)(acac)] 1, which upon oxidation yielded the dioxidovanadium(V) PS–[VVO2(sal–his)] 2 complex. The corresponding non polymer-bound complexes [VIVO(sal–his)(acac)] 3 and [VVO2(sal–his)] 4 have also been obtained. These complexes have been characterised by IR, electronic, 51V NMR and EPR spectral studies, and thermal as well as scanning electron micrograph studies. Complexes 1 and 2 have been used as a catalyst for the oxidation of methyl phenyl sulfide, diphenyl sulfide and benzoin with 30% H2O2 as oxidant. Under the optimised reaction conditions, a maximum of 93.8% conversion of methyl phenyl sulfide with 63.7% selectivity towards methyl phenyl sulfoxide and 36.3% towards methyl phenyl sulfone has been achieved in 2 h with 2. Under similar conditions, diphenyl sulfide gave 83.4% conversion where selectivity of reaction products varied in the order: diphenyl sulfoxide (71.8%) > diphenyl sulfone (28.2%). A maximum of 91.2% conversion of benzoin has been achieved within 6 h, and the selectivities of reaction products are: methylbenzoate (37.0%) > benzil (30.5%) > benzaldehyde-dimethylacetal (22.5%) > benzoic acid (8.1%). The PS-bound complex, 1 exhibits very comparable catalytic potential. These polymer-anchored heterogeneous catalysts do not leach during catalytic action, are recyclable and show higher catalytic activity and turnover frequency than the corresponding non polymer-bound complexes. EPR and 51V NMR spectroscopy was used to characterise methanolic solutions of 3 and 4 and to identify species formed upon addition of H2O2 and/or acid and/or methyl phenyl sulfide.

Benzoin

Sulfoxide

Benzaldehyde

Sulfone

Polystyrene

10.1039/b814297a

Cite

Citations (52)

Facile Synthesis of β-Tetracyano Vanadyl Porphyrin from Its Tetrabromo Analogue and Its Excellent Catalytic Activity for Bromination and Epoxidation Reactions

ACS Omega (2023)

Mannar R. Maurya Ved Prakash Tawseef Ahmad Dar Muniappan Sankar

Complex 2,3,12,13-tetracyano-5,10,15,20-tetraphenylporphyrinatooxidovanadium(IV) {[VIVOTPP(CN)4], 2} has been prepared by nucleophilic substitution of β-bromo groups of the corresponding 2,3,12,13-tetrabromo-5,10,15,20-tetraphenylporphyrinatooxidovanadium(IV) {[VIVOTPP(Br)4], 1} using CuCN in quinoline. Both complexes show biomimetic catalytic activity similar to enzyme haloperoxidases and efficiently brominate various phenol derivatives in the presence of KBr, H2O2, and HClO4 in the aqueous medium. Between these two complexes, 2 exhibits excellent catalytic activity with high turnover frequency (35.5-43.3 s-1) due to the strong electron-withdrawing nature of the cyano groups attached at β-positions and its moderate nonplanar structure as compared to 1 (TOF = 22.1-27.4 s-1). Notably, this is the highest turnover frequency value observed for any porphyrin system. The selective epoxidation of various terminal alkenes using complex 2 has also been carried out, and the results are good, specifying the importance of electron-withdrawing cyano groups. Catalysts 1 and 2 are recyclable, and the catalytic activity proceeds through the corresponding [VVO(OH)TPP(Br)4] and [VVO(OH)TPP(CN)4] intermediates, respectively.

10.1021/acsomega.2c06638

Cite

Citations (13)

Polymer-grafted and neat vanadium(V) complexes as functional mimics of haloperoxidases

Polyhedron (2013)

Mannar R. Maurya Nikita Chaudhary Fernando Avecilla

Salicylaldehyde

Monobasic acid

10.1016/j.poly.2013.09.021

Cite

Citations (40)

Bis(2-[α-hydroxyethyl]benzimidazolato)copper(II) anchored onto chloromethylated polystyrene for the biomimetic oxidative coupling of 2-aminophenol to 2-aminophenoxazine-3-one

Journal of Molecular Catalysis A Chemical (2005)

Mannar R. Maurya Sweta Sikarwar Trissa Joseph S.B. Halligudi

Polystyrene

Arrhenius plot

10.1016/j.molcata.2005.02.034

Cite

Citations (65)

Dioxidomolybdenum(VI) and dioxidouranium(VI) complexes as functional mimic of haloperoxidases catalytic activity in presence of H2O2–KBr–HClO4

Inorganica Chimica Acta (2018)

Mannar R. Maurya Bekele Mengesha Shailendra Kumar Maurya Nidhi Sehrawat Fernando Avecilla

Piperazine

Dibasic acid

Bromothymol blue

Catalytic Oxidation

10.1016/j.ica.2018.11.031

Cite

Citations (11)

CCDC 1858915: Experimental Crystal Structure Determination

The Cambridge Structural Database (2018)

Mannar R. Maurya Nancy Jangra Fernando Avecilla Isabel Correia

10.5517/ccdc.csd.cc20dc0t

Cite

Citations (0)

CCDC 1893279: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Debanjana Biswal Nikhil Ranjan Pramanik Michael G. B. Drew Nancy Jangra Mannar R. Maurya

10.5517/ccdc.csd.cc21k3j8

Cite

Citations (0)

CCDC 1903090: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Monalisa Mohanty Shailendra K. Maurya Atanu Banerjee Sushree Aradhana Patra Mannar R. Maurya

10.5517/ccdc.csd.cc21wb09

Cite

Citations (0)

Biomimetic oxo-, dioxo- and oxo-peroxo-hydrazonato-vanadium(iv/v) complexes

Journal of the Chemical Society Dalton Transactions (2002)

Mannar R. Maurya Shilpa Khurana Wenjian Zhang Dieter Rehder

[VO(acac)2] reacts with HL (HL is the hydrazone Hacpy-inh I, or Hacpy-bhz II; acpy = acetylpyridine, inh = isonicotinic acid hydrazide, bhz = benzoylhydrazide) in dry methanol to yield the oxovanadium(IV) complexes [VOL(acac)] (HL = I: 1, HL = II: 3). The dioxovanadium(V) complexes [VO2L] (HL = I: 2, HL = II: 4) are obtained by aerial oxidation of 1 and 3 in methanol. Treatment of 1 and 3, or 2 and 4, with H2O2 yields the oxoperoxovanadium(V) complexes [VO(O2)L] (HL = I: 5, HL = II: 6). In the presence of catechol or benzohydroxamic acid, 1 and 3 give the mixed chelate complexes [VOL(cat)] (HL = I: 7, HL = II: 8) or [VOL(bha)] (HL = I: 9, HL = II: 10). The peroxo complexes 5 and 6 undergo oxygen transfer reaction with PPh3 in DMF. In DMF and DMSO, 7, 8, 9 and 10 slowly convert to the corresponding dioxo species 2 and 4. Acidification of 2 and 4 with HCl dissolved in methanol affords oxo–hydroxo complexes. Reaction of 7 with L-ascorbic acid yields 2. The crystal and molecular structures of 2 and 4 have been determined, confirming the ONN binding mode of I and II from their enolate form.

Catechol

Hydrazone

Isonicotinic acid

10.1039/b202852m

Cite

Citations (74)