Dr. K.K. SIVAKUMAR

EDUCATION

Ph.D. in Chemistry

RESEARCH, TEACHING, or OTHER INTERESTS

General Chemistry, Environmental Chemistry, Organic Chemistry

Scopus Publications

Interplay of Hydrogen and Halogen Bonds in Supramolecular Framework of Oxy-Acid Based 3-Chloroanilinium Hydrogen Sulfate, Bis(2,5-dichloroanilinium) Sulfate and 2,5-Dichloroanilinium Perchlorate Hydrate Salts
R. Jagan, D. Sathya, and K. Sivakumar
Pleiades Publishing Ltd



ZnO/UV induced photocatalytic degradation of textile dye




Structural studies of hemoglobin from two flightless birds, ostrich and turkey: Insights into their differing oxygen-binding properties
Pandian Ramesh, Selvarajan Sigamani Sundaresan, Nagaraj Shobana, Thangaraj Vinuchakkaravarthy, Kandasamy Sivakumar, Sayed Yasien, and Mondikalipudur Nanjappa Gounder Ponnuswamy
International Union of Crystallography (IUCr)
Crystal structures of hemoglobin (Hb) from two flightless birds, ostrich (Struthio camelus) and turkey (Meleagris gallopova), were determined. The ostrich Hb structure was solved to a resolution of 2.22 Å, whereas two forms of turkey Hb were solved to resolutions of 1.66 Å (turkey monoclinic structure; TMS) and 1.39 Å (turkey orthorhombic structure; TOS). Comparison of the amino-acid sequences of ostrich and turkey Hb with those from other avian species revealed no difference in the number of charged residues, but variations were observed in the numbers of hydrophobic and polar residues. Amino-acid-composition-based computation of various physical parameters, in particular their lower inverse transition temperatures and higher average hydrophobicities, indicated that the structures of ostrich and turkey Hb are likely to be highly ordered when compared with other avian Hbs. From the crystal structure analysis, the liganded state of ostrich Hb was confirmed by the presence of an oxygen molecule between the Fe atom and the proximal histidine residue in all four heme regions. In turkey Hb (both TMS and TOS), a water molecule was bound instead of an oxygen molecule in all four heme regions, thus confirming that they assumed the aqua-met form. Analysis of tertiary- and quaternary-structural features led to the conclusion that ostrich oxy Hb and turkey aqua-met Hb adopt the R-/RH-state conformation.


Antibacterial and Optical Activities of Microwave Aided Zn<inf>2</inf>SnO<inf>4</inf> Nanorods
S. Kumar, , K. K. Sivakumar, Mohammed Kaso Sado, Gutu Ofgaa Ternesgen Garoma, , , and
Sumy State University



Preparation and Studies on ZnO Nanoparticles Doped with Ni, Ca and Fe
Srinivasan Kumar, , K. K. Sivakumar, Naol Dessalegn Dejene, Temesgen Garoma, Asagid Tadesse, , , , and
Sumy State University



Photovoltaic characteristics of chemical bath deposition grown EU-Cds/EU-Pbs fabricated solar cells – enhancement studies




Low cost fabrication of EU: Cds/Pbs heterostructures




Enhancement of photovoltaic properties of CBD grown Pr: Cds/Pbs solar cells




Dihydrogenphosphate Anionic Template-Assisted Hydrogen Bonded Networks in 2-Benzylaminopyridinium and 4-Ethyoxyanilinium Dihydrogenphosphate Salts
R. Jagan and K. Sivakumar
Pleiades Publishing Ltd



Near infrared emission and enhanced ferromagnetism in Fe doped SrSnO <inf>3</inf> perovskite structured nanorods
M. Muralidharan, R. Thiyagarajan, K. Sivakumar, and K. Sivaji
Springer Science and Business Media LLC



Experimental, quantum chemical studies and Hirshfeld surface analysis on molecular structure of two picrate salts: 1, 4-diaza bicyclo [2,22] octane and Furan-2yl methanamine
K. Saminathan, S. Athimoolam, N. Karthikeyan, and K. Sivakumar
Elsevier BV



Study of crystal structure and unique photoluminescence properties of Eu<inf>2-x</inf>Fe<inf>x</inf>O<inf>3</inf> (x = 0 - 0.5) orthoferrites
M. Dhilip, V. Anbarasu, K. Saravana Kumar, and K. Sivakumar
Author(s)
A series of Europium orthoferrites, Eu2-xFexO3 (x = 0 – 0.5) are successfully prepared by employing solid state reaction technique. The structural analysis through powder X-Ray diffraction technique reveals the multiphase formation of all the prepared compounds. Further, the unit cell visualization of all the prepared compounds confirms the change of crystal structure from cubic to orthorhombic phase. The crystal structure analysis confirms the typical framework of Eu – Fe – O chains with unprecedented ratio of Eu3+ and Fe3+ ions. The optical properties of prepared compounds are investigated using photoluminescence (PL) analysis. Upon excitation at 495 nm wavelength, the emission spectrum of prepared compounds exhibits a broad band in the range of 500-700nm with maximum intensity peak at 548 nm (Blue – 2.26eV). Hence, the substitution of Fe3+ ion yields with intrinsic blue photoluminescence (5D0 → 7F0) of Eu3+ and is easily shielded by the substitution of Fe3+ which may be due to the closer conduction band gap of Eu3+ (2.26 eV) with Fe3+ (2.67 eV). The schematic energy level diagram for Fe3+ in the Eu3+ host matrix has been proposed for the better understanding of photoluminescence processes. The variation of intensity of PL peak between 500 and 700 nm for the substitution of Fe in the range of x = 0 – 0.5 yields with interesting optical properties for exploring new phosphor materials for optoelectronic device fabrications.A series of Europium orthoferrites, Eu2-xFexO3 (x = 0 – 0.5) are successfully prepared by employing solid state reaction technique. The structural analysis through powder X-Ray diffraction technique reveals the multiphase formation of all the prepared compounds. Further, the unit cell visualization of all the prepared compounds confirms the change of crystal structure from cubic to orthorhombic phase. The crystal structure analysis confirms the typical framework of Eu – Fe – O chains with unprecedented ratio of Eu3+ and Fe3+ ions. The optical properties of prepared compounds are investigated using photoluminescence (PL) analysis. Upon excitation at 495 nm wavelength, the emission spectrum of prepared compounds exhibits a broad band in the range of 500-700nm with maximum intensity peak at 548 nm (Blue – 2.26eV). Hence, the substitution of Fe3+ ion yields with intrinsic blue photoluminescence (5D0 → 7F0) of Eu3+ and is easily shielded by the substitution of Fe3+ which may be due to the closer conduction ban...


Thermoelectric transport investigations on Cd/In substituted β-Zn<inf>4</inf>Sb<inf>3</inf> compounds
N. Karthikeyan, G. Jaiganesh, V. Anbarasu, Partha Pratim Jana, and K. Sivakumar
Elsevier BV



Room temperature ferromagnetism in Graphene-ZnO nanocomposite
K. Thiyagarajan and K. Sivakumar
Elsevier BV



Defects Induced Magnetism in WO<inf>3</inf> and Reduced Graphene Oxide-WO<inf>3</inf> Nanocomposites
Kamarajan Thiyagarajan, Munisamy Muralidharan, and Kandasamy Sivakumar
Springer Science and Business Media LLC



Effect of transition metal ion substitution on structural and magnetic properties of Eu<inf>2</inf>O<inf>3</inf> sesquioxide system
V. Anbarasu, M. Dhilip, K. Saravana Kumar, and K. Sivakumar
Springer Science and Business Media LLC



Oxygen vacancy-induced room temperature ferromagnetism in graphene–SnO<inf>2</inf> nanocomposites
Kamarajan Thiyagarajan and Kandasamy Sivakumar
Springer Science and Business Media LLC



Effect of trivalent transition metal ion substitution in multifunctional properties of Dy<inf>2</inf>O<inf>3</inf> system
V. Anbarasu, M. Dhilip, K. Saravana Kumar, and K. Sivakumar
Springer Science and Business Media LLC



Crystal structure, DFT study, hirshfeld surface and PIXEL energy calculations of benzimidazolium and hexadecylaminium hydrogen maleate salts
R. Padmavathy, N. Karthikeyan, D. Sathya, R. Jagan, R. Mohan Kumar, and K. Sivakumar
Elsevier BV



Room temperature ferromagnetism in Cr doped SrSnO<inf>3</inf> perovskite system
M. Muralidharan, V. Anbarasu, A. Elaya Perumal, and K. Sivakumar
Springer Science and Business Media LLC



Tuned thermoelectric transport properties of Co<inf>2.0</inf>Sb<inf>1.6</inf>Se<inf>2.4</inf> and Co<inf>2.0</inf>Sb<inf>1.5</inf>M<inf>0.1</inf>Se<inf>2.4</inf> (M=Zn, Sn): Compounds with high phonon scattering
N. Karthikeyan, Sivaprasad Ghanta, Samiran Misra, G. Jaiganesh, Partha Pratim Jana, and K. Sivakumar
Elsevier BV



Crystal structure of 4-methoxyanilinium chloride 4-methoxy aniline
K. Saminathan, R. Jagan, K. Sivakumar, and K. Saravanan
Springer International Publishing



Enhanced ferromagnetism in Cr doped SrMoO<inf>4</inf> scheelite structured compounds
M. Muralidharan, V. Anbarasu, A. Elaya Perumal, and K. Sivakumar
Springer Science and Business Media LLC



Anion assisted supramolecular self-assemblies of succinate and malate adducts: Crystal structures and theoretical modelling
R. Padmavathy, N. Karthikeyan, D. Sathya, R. Jagan, R. Mohan Kumar, and K. Sivakumar
Royal Society of Chemistry (RSC)
A series of five dicarboxylic acid complexes of succinic acid and malic acid with various substituted amines have been synthesized and structurally analyzed; also the supramolecular organizations within their crystalline solids have been studied.


Enhanced visible photoluminescent and structural properties of ZnO/KIT-6 nanoporous materials for white light emitting diode (w-LED) application
B. Sathyaseelan, E. Manikandan, K. Sivakumar, J. Kennedy, and M. Maaza
Elsevier BV

RECENT SCHOLAR PUBLICATIONS