Dr. Anant Kumar Srivastava

Scopus Publications

A new avenue to relaxor-like ferroelectric behaviour found by probing the structure and dynamics of [NH3NH2]Mg(HCO2)3
Thomas J. Hitchings, Helen M. Wickins, George U. L. Peat, Paul Hodgkinson, Anant Kumar Srivastava, Teng Lu, Yun Liu, Ross O. Piltz, Franz Demmel, Anthony E. Phillips, Paul J. Saines
Journal of Materials Chemistry C, 2023
Analysis of the average and local structure in (NH3NH2)Mg(HCO2)3 reveals a new source of relaxor ferroelectric like behaviour in a hybrid framework.
Spectroscopic Identification of Disordered Molecular Cations in Defect Perovskite-Like ALn(HCO2)(C2O4)1.5 (Ln=Tb-Er) Phases
Lydia G. Burley, Anant Kumar Srivastava, Svemir Rudić, Paul James Saines
European Journal of Inorganic Chemistry, 2021
Abstract This work reports a new series of A Ln (HCO 2 )(C 2 O 4 ) 1.5 (A=[(CH 3 ) 2 NH 2 ] + and Ln 3+ =Tb 3+ ‐Er 3+ ) compounds made solvothermally. These Cmce phases combine monovalent and divalent ligands, which enables a scarce combination of A + and B 3+ cations in a hybrid perovskite‐like compound. The ratio of ligands leads to ordered anion vacancies, which alternate with oxalate linkers along the c ‐axis. The A‐site cations are disordered and cannot be identified crystallographically, likely a result of the larger pores of these frameworks compared to the recently reported AEr(HCO 2 ) 2 (C 2 O 4 ) phases. Neutron and infrared spectroscopy, supported by elemental composition, enables these cations to be identified as [(CH 3 ) 2 NH 2 ] + molecules. Magnetic property measurements suggest these materials have weak antiferromagnetic interactions but remain paramagnetic to 1.8 K.
Enhancing the chemical flexibility of hybrid perovskites by introducing divalent ligands
Lydia G. Burley, James H. Beecham-Lonsdale, Anant Kumar Srivastava, Ines E. Collings, Paul J. Saines
Dalton Transactions, 2021
Incorporating divalent ligands allows for solely A+ and B3+ cations in hybrid perovskites observed to have anisotropic thermal expansion.
Dual-site aqua mononuclear nickel(II) complexes of non-heme tetradentate ligands: Synthesis, characterization and reactivity
Sarvesh S. Harmalkar, Dattaprasad D. Narulkar, Raymond J. Butcher, Mahesh S. Deshmukh, Anant Kumar Srivastava, Mariappan Mariappan, Prem Lama, Sunder N. Dhuri
Inorganica Chimica Acta, 2019
Mononuclear compounds [Ni(BQCNMe2)(H2O)2](ClO4)2 1 and [Ni(BQCNH2)(H2O)2](ClO4)2 2 of N,N′-dimethyl-N,N′-di(quinolin-8-yl)cyclohexane-1,2-diamine (BQCNMe2) and N,N′-di(quinolin-8-yl)cyclohexane-1,2-diamine (BQCNH2) were synthesised and characterized by elemental analysis, IR/UV-Vis spectroscopy, cyclic voltammetry (CV)/differential pulse voltammetry (DPV) and X-ray powder pattern. [Ni(BQCNMe2)(en)](ClO4)2 3 and [Ni(BQCNMe2)(phen)](ClO4)2 4 were prepared by reacting 1 with ethylenediamine (en) and 1,10-phenanthroline (phen) respectively while [Ni(BQCNH2)(en)](ClO4)2 5 and [Ni(BQCNH2)(phen)](ClO4)2 6 were obtained from the reaction of 2. Compounds [Ni(BQENMe2)(en)](ClO4)2 7 and [Ni(BQENH2)(en)](ClO4)2.CH3CN 8 (BQENMe2 is N,N′-dimethyl-N,N′-bis(8-quinolyl)ethane-1,2-diamine) and BQENH2 is N,N′-bis(8-quinolyl)ethane-1,2-diamine) were synthesised similarly. Compounds 6 and 8 were characterized by single crystal X-ray diffractometry and their structural features are presented. The reactivity of 2 with H2O2/base was investigated. A new peak at 570 nm in the UV-Vis spectrum corresponding to 2a was obtained which on addition of 2-phenylpropionaldehyde (2-PPA) decays giving pseudo-first order rate constant of 9.2 × 10−3 s−1 and acetophenone as a major product. The catalytic hydroxylation of cumene and ethylbenzene by 1 and 2 in the presence of meta-chloroperbenzoic acid (m-CPBA) was investigated.
Low dimensional and frustrated antiferromagnetic interactions in transition metal chloride complexes with simple amine ligands
James E. Chalmers, Anant Kumar Srivastava, Richard J. C. Dixey, Krrishna Sivakumaran, Paul J. Saines
Crystengcomm, 2019
New transition metal chloride complexes with hydrazinium and methylhydroxylamine ligands are reported featuring low dimensional and frustrated magnetic interactions.
Crystal Structure of Mononuclear Non-Heme Nikel(II) Octahedral Complex: [Ni(bqenH2)(bpy)](ClO4)2·0.125H2O
D. D. Narulkar, A. K. Srivastava, R. J. Butcher, S. N. Dhuri
Journal of Structural Chemistry, 2018
The crystal structure of a mononuclear Ni(II) complex [Ni(bqenH2)(bpy)](ClO4)2·0.125H2O 1 (where bqenH2 is N,N′-bis(8-quinolyl)ethane-1,2-diamine, bpy = 2,2′-bipyridine) is reported here. The crystallographic data for 1 are as follows: monoclinic crystal system, P21/n space group, a = 17.3255(11), b = 10.6110(7), c = 34.328(2) Å, α = 90°, β = 93.9480(13)°, γ = 90°, V = 6295.8(7) Å3, Z = 4, dx = 1.541 mg/m3. The nickel(II) ion coordinates four N atoms of the tetradentate ligand bqenH2 and two N atoms of the auxiliary bidentate 2,2′-bipyridine ligand, resulting in a slightly distorted NiN6 octahedron with two perchlorates serving as charge balancing counter anions. The overall structure of 1 is stabilized by the presence of water of crystallization in the crystal lattice. The crystal structure shows two symmetrically identical octahedral NiN6 units in its asymmetric unit. The extensive hydrogen bonding network resulting in a supramolecular architecture is observed due to the N–H⋯O, O–H⋯O, O–H⋯Cl, and N–H⋯Cl interactions.
A Flexible Composite Mechanical Energy Harvester from a Ferroelectric Organoamino Phosphonium Salt
Thangavel Vijayakanth, Anant Kumar Srivastava, Farsa Ram, Priyangi Kulkarni, Kadhiravan Shanmuganathan, Balu Praveenkumar, Ramamoorthy Boomishankar
Angewandte Chemie International Edition, 2018
A new binary organic salt diphenyl diisopropylamino phosphonium hexaflurophosphate (DPDP⋅PF6 ) was shown to exhibit a good ferroelectric response and employed for mechanical energy harvesting application. The phosphonium salt crystallizes in the monoclinic noncentrosymmetric space group Cc and exhibits an H-bonded 1D chain structure due to N-H⋅⋅⋅F interactions. Ferroelectric measurements on the single crystals of DPDP⋅PF6 gave a well-saturated rectangular hysteresis loop with a remnant (Pr ) polarization value of 6 μC cm-2 . Further, composite devices based on polydimethylsiloxane (PDMS) films for various weight percentages (3, 5, 7, 10 and 20 wt %) of DPDP⋅PF6 were prepared and examined for power generation by using an impact test setup. A maximum output peak-to-peak voltage (VPP ) of 8.5 V and an output peak-to-peak current (IPP ) of 0.5 μA was obtained for the non-poled composite film with 10 wt % of DPDP⋅PF6 . These results show the efficacy of organic ferroelectric substances as potential micropower generators.
Synthesis and characterization of N3Py2 ligand-based cobalt(II), nickel(II) and copper(II) catalysts for efficient conversion of hydrocarbons to alcohols
Dattaprasad D. Narulkar, Anant Kumar Srivastava, Raymond J. Butcher, Kanakappan M. Ansy, Sunder N. Dhuri
Inorganica Chimica Acta, 2017
Three new complexes [Co(N3Py2)(H 2 O)](ClO 4 ) 2 1 , [Ni(N3Py2)(H 2 O)](ClO 4 ) 2 2 and [Cu(N3Py2)](ClO 4 ) 2 3 (N3Py2 is N , N ′-dimethyl- N -(2-(methyl(pyridin-2-ylmethyl)amino)ethyl)- N ′-(pyridin-2-ylmethyl)ethane-1,2-diamine) have been synthesized and characterized. Non-heme ligand N3Py2 have been prepared by Eschweiler-Clarke method and reported for the first time. Compounds 1 and 2 were characterized by single crystal X-ray structure analysis. The structure of 1 and 2 revealed that Co(II) cation in 1 and Ni(II) cation in 2 are bonded to the five nitrogen atoms of N3Py2 and a water molecule thus forming an octahedral motif [M(N3Py2)(H 2 O)] 2+ . For compound 3 , a square pyramidal geometry has been proposed based on the spectroscopic, elemental analysis and ESI-MS data. Compounds 1 – 3 were tested as catalysts in the oxidation of cumene and adamantane using m -CPBA. Comparative effect of counter anions on the product yields was observed when the perchlorates anions of 1 – 3 were replaced with tetraphenylborates to give compounds 1a – 3a . The turnover numbers of alcohol over ketone product increased in order of catalysts, 1 ( 1a ) > 2 ( 2a ) > 3 ( 3a ).
Altering polarization attributes in ferroelectric metallo-cavitands by varying hydrated alkali-metal guest cations
Anant Kumar Srivastava, Thangavel Vijayakanth, Pillutla Divya, B. Praveenkumar, Alexander Steiner, Ramamoorthy Boomishankar
Journal of Materials Chemistry C, 2017
Two new M4L8-type metallo-cavitands and their hydrated alkali metal ion encapsulated host–guest complexes were synthesized and studied for their tunable ferroelectric behaviour.
Anion-induced ferroelectric polarization in a luminescent metal-organic cage compound
Ashok Yadav, Anant Kumar Srivastava, Priyangi Kulkarni, Pillutla Divya, Alexander Steiner, B. Praveenkumar, Ramamoorthy Boomishankar
Journal of Materials Chemistry C, 2017
A cage assembly consisting of an axially symmetric nonpolar octahedral [Zn6L8] core exhibits an interesting multifunctional luminescence and ferroelectric order at room temperature. The ferroelectric response originates from the toggling of nitrate anions and solvate molecules found in pockets between the cages.
Functional metal-organic molecules and materials derived from rigid and flexible P-N scaffolds
Ramamoorthy Boomishankar, Anant Kumar Srivastava
Phosphorus Sulfur and Silicon and the Related Elements, 2016
Heteronuclear Ni(ii)-Ln(iii) (Ln = La, Pr, Tb, Dy) complexes: Synthesis and single-molecule magnet behaviour
Apoorva Upadhyay, Chinmoy Das, Stuart K. Langley, Keith S. Murray, Anant K. Srivastava, Maheswaran Shanmugam
Dalton Transactions, 2016
Potentially Ferroelectric {CuIIL2}n Based Two-Dimensional Framework Exhibiting High Polarization and Guest-Assisted Dielectric Anomaly
Anant Kumar Srivastava, Pillutla Divya, B. Praveenkumar, Ramamoorthy Boomishankar
Chemistry of Materials, 2015
A tetrakis(amido)phosphonium cation containing 2-pyridyl (2Py) substituents,[P(NH2Py)4]+ and its reactivity studies with Ag(I) salts
ARVIND K GUPTA, ANANT KUMAR SRIVASTAVA, RAMAMOORTHY BOOMISHANKAR
Journal of Chemical Sciences, 2015
A neutral cluster cage with a tetrahedral [Pd 12IIL6] framework: Crystal structures and host-guest studies
Arvind K. Gupta, Ashok Yadav, Anant Kumar Srivastava, Kormathmadam Raghupathy Ramya, Harshad Paithankar, Shyamapada Nandi, Jeetender Chugh, Ramamoorthy Boomishankar
Inorganic Chemistry, 2015
Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster
Apoorva Upadhyay, Navatha Komatireddy, Alberto Ghirri, Floriana Tuna, Stuart K. Langley, Anant K. Srivastava, E. Carolina Sañudo, Boujemaa Moubaraki, Keith S. Murray, Eric J. L. McInnes, Marco Affronte, Maheswaran Shanmugam
Journal of the Chemical Society Dalton Transactions, 2014
Probing the magnetic and magnetothermal properties of M(ii)–Ln(iii) complexes (where M(ii) = Ni or Zn; Ln(iii) = La or Pr or Gd)
Naushad Ahmed, Chinmoy Das, Shefali Vaidya, Anant Kumar Srivastava, Stuart K. Langley, Keith S. Murray, Maheswaran Shanmugam
Journal of the Chemical Society Dalton Transactions, 2014
Anion driven [CuIIL2]n frameworks: Crystal structures, guest-encapsulation, dielectric, and possible ferroelectric properties
Anant Kumar Srivastava, B. Praveenkumar, Indra Kumar Mahawar, Pillutla Divya, S. Shalini, Ramamoorthy Boomishankar
Chemistry of Materials, 2014
A cationic copper(I) iodide cluster MOF exhibiting unusual ligand assisted thermochromism
Ashok Yadav, Anant Kumar Srivastava, Ayyakkalai Balamurugan, Ramamoorthy Boomishankar
Dalton Transactions, 2014
Hydroxo-bridged dimers of oxo-centered ruthenium(III) triangle: Synthesis and spectroscopic and theoretical investigations
Apoorva Upadhyay, Jitendrasingh Rajpurohit, Mukesh Kumar Singh, Richa Dubey, Anant Kumar Srivastava, Ashutosh Kumar, Gopalan Rajaraman, Maheswaran Shanmugam
Chemistry A European Journal, 2014
Discrete and polymeric Cu(II) complexes derived from in situ generated pyridyl-functionalized bis(amido)phosphate ligands, [PO2(NHPy) 2]-
Arvind K. Gupta, Anant Kumar Srivastava, Indra Kumar Mahawar, Ramamoorthy Boomishankar
Crystal Growth and Design, 2014
Synthesis and characterization of 3d and 4f metal complexes of Schiff base ligands
Apoorva Upadhyay, Shefali Vaidya, Vakacharla S. Venkatasai, Prabha Jayapal, Anant K. Srivastava, Muralidharan Shanmugam, Maheswaran Shanmugam
Polyhedron, 2013