A5063374156- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Metal-Organic Frameworks: Synthesis and Applications
- Supramolecular Chemistry and Complexes
- Lanthanide and Transition Metal Complexes
- Molecular Sensors and Ion Detection
- Electrochemical Analysis and Applications
- Catalytic Cross-Coupling Reactions
- Crystal structures of chemical compounds
- Crystallography and molecular interactions
- Nanocluster Synthesis and Applications
- Concrete Corrosion and Durability
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Supramolecular Self-Assembly in Materials
- Luminescence and Fluorescent Materials
- Surfactants and Colloidal Systems
- Polyoxometalates: Synthesis and Applications
- Metal-Catalyzed Oxygenation Mechanisms
- Analytical Chemistry and Sensors
- Nonlinear Optical Materials Research
- Advanced biosensing and bioanalysis techniques
- Chemical Reaction Mechanisms
Indian Institute of Technology Dhanbad
2009-2025
Hanyang University
2004-2008
Kyungpook National University
2008
Pohang Accelerator Laboratory
2006-2008
Pohang University of Science and Technology
2006-2007
Korea University
2007
Cochin University of Science and Technology
2002-2006
Catholic University of Korea
2005-2006
Sunchon National University
2006
The face-driven corner-linked truncated octahedral nanocages, [Pd6L8]12+ (1, L1 = N,N',N' '-tris(3-pyridinyl)-1,3,5-benzenetricarboxamide; 2, L2 '-tris(4-pyridinylmethyl)-1,3,5-benzenetricarboxamide), were prepared with eight C3-symmetric tridentate ligands and six square planar tetratopic palladium(II) ions. combination of the nitrogen donor atom at a ∼120° kink position carboxamido pyridinyl group tilted pyridyl versus facial plane can provide needed curvature for formation cages. atoms...
Hexanuclear, octanuclear, and decanuclear manganese metalladiazamacrocycles have been prepared by reacting a series of pentadentate ligands, N-acylsalicylhydrazides (N-(3-methylbutanoyl)salicylhydrazide (H(3)3-mbshz), N-(phenylacetyl)salicylhydrazide (H(3)pashz), N-(3,3-dimethylbutanoyl)salicylhydrazide (H(3)3-dmbshz), N-(2-methylpropanoyl)salicylhydrazide (H(3)2-mpshz), N-((R,S)-2-methylbutanoyl)salicylhydrazide (H(3)RS-2-mbshz), N-((S)-2-methylbutanoyl)salicylhydrazide (H(3)S-2-mbshz),...
A novel S4-symmetric icosanuclear manganese metalladiazamacrocycle was synthesized using a pentadentate ligand, N-3-phenyl-trans-2-propenoylsalicylhydrazide (H3L), that has rigid and bulky terminal N-acyl group. 20 cyclic repeat of an--(Mn-N-N)--linkage resulted in highly puckered diaza-bridged 60-membered metallamacrocycle. The steric interaction between the ligands system leads to five consecutive Mn(III) centers chemically different--(Mn(A)Mn(B)Mn(C)Mn(D)Mn(E))--environment, with...
Discrete metal-organic polyhedra (MOP) with nanosized cavities and/or clusters of MOP could be prepared when C3-symmetric facial ligands and a potential hexatopic Cu(II) ion are combined in the presence perchlorate as weak linker, while similar reaction conditions nitrate linker led to extended frameworks made supramolecular building blocks.
A C3 symmetric pentadecanuclear metallamacrocycle was obtained by the self-assembly of a pentadentate bridging ligand, N-phenylpropiolyl salicylhydrazide (H3L), and manganese ion. The combination narrow Cα−Cβ region near domain bulky phenyl end away from as steric induced clockwise twists in cycle. resulting macrocycle with sextuple twisted Möbius topology stabilized extensive weak intramolecular interactions.
An extended 36-membered dodecanuclear manganese metallamacrocycle with S12 symmetry has been synthesized using the ligand N-cyclohexanoylsalicylhydrazide (H3chxshz) by a self-assembly that accommodates cyclooctane of conformationally strained S4 in its hydrophobic cavity.
A novel dodecanuclear manganese metalladiazamacrocycle was synthesized employing a new pentadentate ligand N-2-pentenoylsalicylhydrazide (H3tpeshz) by supramolecular self-assembly. The backbone of this metal-organic assembly is repeating unit an M–N–N–M linkage that extends to complete 36-membered cyclic structure involving 12 manganese(III) centers. Successive centers are in chemically different ⋯ABABAB⋯-type environment while the chirality varies as ⋯ΛΛΔΔΛΛ⋯. unique arrangement results...
Either an S 8 symmetrical 48-membered hexadecanuclear or 10 60-membered icosanuclear manganese metallamacrocycle was self-assembled using a ion and ditopic pentadentate ligand. This either N-4-phenylbenzoylsalicylhydrazide (H 3pbshz) containing rigid rod-shaped, bulky biphenyl residue as terminal N-acyl group N-3,3-diphenylpropionylsalicylhydrazide 3dppshz) flexible beta-branched group, but with two sterically phenyl residues at the Cbeta position. The backbone of these metal-organic...
An S6-symmetric hexanuclear gallium metalladiazamacrocycle, [Ga(III)(6)L2(6)S6] with a -(lamda delta)(lamda delta)-chiral sequence and an S-symmetric hexadecanuclear manganese [Mn(III)(16)L2(16)S16] lamda delta were prepared using the same N2-trans-cinnamoyl-2-hydroxy-3-naphthoylhydrazide (H3L2) as bridging pentadentate ligand between metal centers for formation of macrocyclic system.
Metalladiazamacrocycles, coordination driven potential supramolecular host systems, can be obtained via cyclic linkages of the metal ions and bridging ligands, N-acylsalicylhydrazides. The nuclearity shape metallamacrocycles could modulated by controlling steric interactions caused N-acyl tails ligands. macrocycles utilized for recognition small organic guest molecules using their hydrophobicity/hydrophilicity, size shape/symmetry cavities. In addition, these used as building blocks...
Two topologically different metallamacrocycles--S8 symmetric octanuclear gallium(III) metalladiazamacrocycle and pseudo-D4 metalladiazamacrocycle--could be prepared using two similar heteroditopic bridging ligands having asymmetrical tridentate-bidentate binding residues.
A detailed study has been done on the rheological properties of sodium oleate based hydrogels that are developed in presence organic and inorganic salts. Shear stability NaOL gels were found to be a strong function salt, alkali, fabrication conditions. The addition alkali NaOL/KCl hydrogel enhanced viscoelastic properties, which observed from static dynamic tests. is miscible with hydrocarbon can act as clean gel during postfracturing job. quantitative estimation migration microemulsion...