Bharat Kumar Tripuramallu

Bio: Bharat Kumar Tripuramallu is an academic researcher from Vignan University. The author has contributed to research in topics: Supramolecular chemistry & Crystal structure. The author has an hindex of 15, co-authored 34 publications receiving 574 citations. Previous affiliations of Bharat Kumar Tripuramallu include University of Hyderabad & Tel Aviv University.

Factors Affecting the Conformational Modulation of Flexible Ligands in the Self-Assembly Process of Coordination Polymers: Synthesis, Structural Characterization, Magnetic Properties, and Theoretical Studies of [Co(pda)(bix)]n, [Ni(pda)(bix)(H2O)]n, [Cu(pda)(bix)2(H2O)2]n·8nH2O, [Co2(μ-OH)(pda)(ptz)]n·nH2O, [Co(hfipbb)(bix)0.5]n, and [Co(2,6-pydc)(bix)1.5]n·4nH2O

Abstract: Six new metal complexes with the formulae [Co(pda)(bix)]n (1), [Ni(pda)(bix)(H2O)]n (2), [Cu(pda)(bix)2(H2O)2]n·8nH2O (3), [Co2(μ-OH)(pda)(ptz)]n·nH2O (4), [Co(hfipbb)(bix)0.5]n (5), and [Co(2,6-py...

Hydrothermal Synthesis and Structural Characterization of Metal Organophosphonate Oxide Materials: Role of Metal-Oxo Clusters in the Self Assembly of Metal Phosphonate Architectures

Abstract: Two new metal organophosphonate oxide materials with formulas [CuII4CuI2(L)2(2,2′-bpy)6(HPW12O40)]n·4nH2O (1) and [Cu(2,2′-bpy)VO2(OH)(H2L)]n (2) have been synthesized starting from the Cu(II) salt...

Influential Role of Geometrical Disparity of Linker and Metal Ionic Radii in Elucidating the Structural Diversity of Coordination Polymers Based on Angular Dicarboxylate and Bis-pyridyl Ligands

Abstract: As a continuation of our recent investigations on coordination polymer/metal–organic framework containing compounds, herein, four new coordination polymers, namely, {Co2(ADA)2(px2ampy)}n (1), {Cd(ADA)(px2ampy)0.5}n (2), {Co2(IPTA)2(px2ampy)}n (3), {Mn(IPTA)(px3ampy)}n (4) have been synthesized, based on the flexible dicarboxylate ligand H2ADA and rigid dicarboxylate ligand H2IPTA along with long flexible bis-pyridyl linkers as coligand (where H2ADA = 1,3-adamantanediacetic acid; H2IPTA = isopthalic acid; px2ampy = 1,4-bis(2-pyridylaminomethyl)benzene; px3ampy = 1,4-bis(3-pyridylaminomethyl)benzene). Compounds 1–4 have been characterized by routine elemental analysis, IR spectroscopy, and thermogravimetric (TG) analysis and unambiguously by single crystal X-ray diffraction analysis. The solid-state luminescent property of compound 2 has been additionally characterized. Compound 1 is a two-dimensional (2D) framework, constructed by the connectivity of Co2 paddle-wheels as secondary building units (SBUs) and...

MnII and CoII Coordination Polymers Showing Field-Dependent Magnetism and Slow Magnetic Relaxation Behavior

Abstract: Four new MnII- and CoII-containing magnetic coordination polymers, [{Mn(Br-isa)(bpe)·1/2H2O}n (1), {Co(Br-isa)(bpe)1.5·1/2H2O}n (2), [{Mn(Br-isa)(4-bpmh)}4·6H2O]n (3), and [{Co(Br-isa)(4-bpmh)}2·21/2H2O]n (4)] [isa = isophthalic acid, bpe = 1,2-bis-(4-pyridyl)ethylene and 4-bpmh = N,N′-bispyridine-4-yl-methylene-hydrazine], have been synthesized at room temperature, using 5-bromo isophthalic acid (Br-H2isa) and two different N-donating ancillary ligands. The complexes have been characterized by single-crystal X-ray diffraction and other physicochemical techniques. Structure determination reveals two-dimensional (2D) coordination network architectures for all the complexes. In 1, 3, and 4, MnII and CoII dinuclear units are connected via Br-H2isa ligands to form infinite 1D chains. The ancillary N,N′-donor spacer ligands interconnect the 1D chains into 2D coordination layers. Complex 2, on the other hand, can be viewed as being composed of cationic [{Co(bpe)}4]8+ square units that are joined by anionic Br-i...

Mechanistic Aspects for the Formation of Copper Dimer Bridged by Phosphonic Acid and Extending Its Dimensionality by Organic and Inorganic Linkers: Synthesis, Structural Characterization, Magnetic Properties, and Theoretical Studies

Abstract: Six new copper metal complexes with formulas Cu(H2O)(2,2'-bpy) (H2L)](2) center dot H4L center dot 4 H2O (1), {Cu(H2O)(2,2'-bpy)-(H3L)}(2)(H2L)]center dot 2H(2)O (2), Cu(H2O)(1,10-phen)(H2L)](2)center dot 6H(2)O (3), Cu(2,2'-bpy)(H2L)](n)center dot nH(2)O (4), Cu(1,10-phen)(H2L)](n)center dot 3nH(2)O (5), and {Cu(2,2'-bpy)(MoO3)}(2)(L)](n)center dot 2nH(2)O (6) have been synthesized starting from p-xylylenediphosphonic acid (H4L) and 2,2'-bipyridine (2,2'-bpy) or 1,10-phenanthroline (1,10-phen) as secondary linkers and characterized by single crystal X-ray diffraction analysis, IR spectroscopy, and thermogravimetric (TG) analysis. All the complexes were synthesized by hydrothermal methods. A dinuclear motif (Cu-dimer) bridged by phosphonic acid represents a new class of simple building unit (SBU) in the construction of coordination architectures in metal phosphonate chemistry. The initial pH of the reaction mixture induced by the secondary linker plays an important role in the formation of the molecular phosphonates 1, 2, and 3. Temperature dependent hydrothermal synthesis of the compounds 1, 2, and 3 reveals the mechanism of the self assembly of the compounds based on the solubility of the phosphonic acid H4L. Two-dimensional coordination polymers 4, 5, and 6, which are formed by increasing the pH of the reaction mixture, comprise Cu-dimers as nodes, organic (H2L) and inorganic (Mo4O12) ligands as linkers. The void space-areas, created by the (4,4) connected nets in compounds 4 and 5, are occupied by lattice water molecules. Thus compounds 4 and 5 have the potential to accommodate guest species/molecules. Variable temperature magnetic studies of the compounds 3, 4, 5, and 6 reveal the antiferromagnetic interactions between the two Cu(II) ions in the eight membered ring, observed in their crystal structures. A density functional theory (DFT) calculation correlates the conformation of the Cu-dimer ring with the magnitude of the exchange parameter based on the torsion angle of the conformation.

The Halogen Bond

Abstract: The halogen bond occurs when there is evidence of a net attractive interaction between an electrophilic region associated with a halogen atom in a molecular entity and a nucleophilic region in another, or the same, molecular entity. In this fairly extensive review, after a brief history of the interaction, we will provide the reader with a snapshot of where the research on the halogen bond is now, and, perhaps, where it is going. The specific advantages brought up by a design based on the use of the halogen bond will be demonstrated in quite different fields spanning from material sciences to biomolecular recognition and drug design.

Structures of Metal–Organic Frameworks with Rod Secondary Building Units

Abstract: Rod MOFs are metal–organic frameworks in which the metal-containing secondary building units consist of infinite rods of linked metal-centered polyhedra. For such materials, we identify the points of extension, often atoms, which define the interface between the organic and inorganic components of the structure. The pattern of points of extension defines a shape such as a helix, ladder, helical ribbon, or cylinder tiling. The linkage of these shapes into a three-dimensional framework in turn defines a net characteristic of the original structure. Some scores of rod MOF structures are illustrated and deconstructed into their underlying nets in this way. Crystallographic data for all nets in their maximum symmetry embeddings are provided.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications.

Abstract: Among the recent developments in metal-organic frameworks (MOFs), porous layered coordination polymers (CPs) have garnered attention due to their modular nature and tunable structures. These factors enable a number of properties and applications, including gas and guest sorption, storage and separation of gases and small molecules, catalysis, luminescence, sensing, magnetism, and energy storage and conversion. Among MOFs, two-dimensional (2D) compounds are also known as 2D CPs or 2D MOFs. Since the discovery of graphene in 2004, 2D materials have also been widely studied. Several 2D MOFs are suitable for exfoliation as ultrathin nanosheets similar to graphene and other 2D materials, making these layered structures useful and unique for various technological applications. Furthermore, these layered structures have fascinating topological networks and entanglements. This review provides an overview of different aspects of 2D MOF layered architectures such as topology, interpenetration, structural transformations, properties, and applications.