Ananta Kumar Ghosh

Bio: Ananta Kumar Ghosh is an academic researcher from Indian Association for the Cultivation of Science. The author has contributed to research in topics: Crystal structure & Supramolecular chemistry. The author has an hindex of 13, co-authored 14 publications receiving 470 citations.

Hydrogen-Bonded Assembly of Water and Chloride in a 3D Supramolecular Host

Abstract: The hydrogen-bonded water-chloride assembly {[(H2O)14Cl2]2-}n, which is stabilized in a template of metal organic supramolecular host (MOSH) {[Cu4(phen)4(adi)(OH)2Cl2]2+}n(adi = adipate dianion; phen = 1,10-phenanthroline), was isolated. DFT calculations corroborate the X-ray crystal structure of the hydrogen-bonded water-chloride assembly. The variable temperature magnetic study also corroborates the single-crystal structure.

Novel solid-state molecular self-assemblies of manganese (II) constructed with flexible-ligands: Influences of π-π and C-H...π interactions on their crystal packing

Abstract: Three supramolecular networks are synthesized by the combination of Mn(II) and flexible ligands [1,2-bis (4-pyridyl) ethane (bpe); 1,3-bis (4-pyridyl) propane (bpp); 4,4‘-bipyridyl disulfide (bpds)], characterized by single-crystal X-ray analysis All three complexes have extended solid-state structure formed by π−π interactions, and there is an excellent opportunity to elucidate the difference in the formation of extended networks in these three complexes Complex 1, which is reported in a paper earlier by our group, is an unprecedented three-dimensional (3D) “honeycomb”-like architecture constructed from a novel sinusoidal one-dimensional (1D) chain [Mn(bpe)(H2O)4]2+ through π−π interactions in which bpe is used as a bidentate bridging ligand Complex [{Mn(bpp)3Cl2}(H2O)2]n 2 generates a “standing wave”-like architecture by π−π interactions from a neutral zigzag 1D chain of [Mn(bpp)3Cl2] Complex [{Mn(bpds)2(dca)2(H2O)2}(H2O)4(bpds)]n 3 is a neutral monomer [Mn(bpds)2(dca)2(H2O)2], which is self-assembl

Synthesis, Crystal Structure, and Magnetic Behavior of Two Dicyanamido-Bridged Complexes of Manganese(II): Effect of Weak Interaction in Carving Regular Geometry

Abstract: Two new dicyanamido-bridged polymeric complexes of manganese(II), [Mn(dca)2(pic)2]n 1 and [Mn(dca)2(biim)]n 2 (dca = dicyanamide, pic = 4-picoline, biim = 2,2‘-biimidazole), have been synthesized a...

Structural diversity in manganese squarate frameworks using N,N-donor chelating/bridging ligands: syntheses, crystal structures and magnetic properties

Abstract: Three new polymeric squarato-bridged manganese complexes {[Mn(H2O)2(bpe)(sq)]·bpe·H2O}n (1), [Mn2(H2O)4(phen)2(sq)2]n (2) and [Mn2(H2O)2(phen)4(sq)]·(sq)·8(H2O) (3) [bpe, 1,2-bis(4-pyridyl)ethane; phen, 1,10-phenanthroline; sq, squarate dianion] have been synthesized and characterized by single crystal X-ray diffraction analysis and variable temperature magnetic studies. Complex 1 is a 2D rectangular grid-like structure, achieved through flexible bpe bridging ligands and squarate dianions. On the other hand the use of chelating phen instead of bpe gives rise to a 1D polymeric chain in complex 2 and to a dinuclear entity in 3. In all the three complexes weak interactions play a vital role in stabilizing the solid-state structure. Variable temperature (2–300 K) magnetic studies indicate weak antiferromagnetic coupling between the metal centres in all the complexes.

Self-assembly of organic-inorganic hybrid materials constructed from eight-connected coordination polymer hosts with nanotube channels and polyoxometalate guests as templates.

Abstract: Two polyoxometalate-templated organic–inorganic hybrid porous frameworks, namely, [Cu2(H2O)2(bpp)2Cl][PM12O40]·∼20H2O (for 1, M = W; for 2, M = Mo; bpp = 1,3-bis(4-pyridyl)propane), were self-assembly obtained and structurally determined by elemental analyses, inductively coupled plasma analyses, infrared spectroscopy, and single-crystal X-ray diffraction analyses. Single-crystal X-ray analysis of these crystals revealed that both of the structures are constructed from eight-connected three-dimensional coordination polymer hosts [Cu2(H2O)2(bpp)2Cl]n3n+ and ball-shaped Keggin-type guests [PM12O40]n3n− as templates. The polymer hosts resulted from a bcc-type framework with nanotubes, and the nanotubes can be regarded as a tetra-stranded helix structure. Furthermore, compounds 1 and 2 exhibit photoluminescent properties at ambient temperature, and the compound 2 bulk-modified carbon paste electrode (2-CPE) displays good electrocatalytic activity toward the reduction of nitrite.

On the Possibility of Tuning Molecular Edges To Direct Supramolecular Self-Assembly in Coumarin Derivatives through Cooperative Weak Forces: Crystallographic and Hirshfeld Surface Analyses

Abstract: Four organic compounds based on substituted coumarin derivatives (1–4) have been synthesized and characterized by X-ray structural studies with a detailed analysis of Hirshfeld surface and fingerprint plots facilitating a comparison of intermolecular interactions in building different supramolecular architectures. The X-ray study reveals that in the molecular packing C–H···O, π···π, and carbonyl (lone pair)···π interactions cooperatively take part. The recurring feature of the self-assembly in all the compounds is the appearance of the molecular ribbon through weak hydrogen bonding. These hydrogen bonded ribbons further stacked into molecular layers by π···π forces. The mode of cooperativity of the weak C–H···O and π···π forces is such that they operate in mutually perpendicular directions — hydrogen bonding in the plane of the molecule at their edges and π-stacking perpendicular to the molecular plane. Investigation of intermolecular interactions and crystal packing via Hirshfeld surface analyses reveals...

Extended Networks of Co2+ and Mn2+ Bridged by NCS–/N3– Anions and Flexible Long Spacers: Syntheses, Structures, and Magnetic Properties

Abstract: Four new metal-organic polymers with SCN–/N3– anion bridges and flexible long spacers L {L = bim [1,2-bis(imidazol-1-yl)ethane] and bte [1,2-bis(1,2,4-triazol-1-yl)ethane]}, [Co(SCN)2(bim)] (1-Co), [Co(SCN)2(bte)] (2-Co), [Mn(N3)2(bte)] (3-Mn), and [Mn(N3)2(bim)] (4-Mn), were synthesized and characterized by single-crystal X-ray diffraction studies and their magnetic properties were investigated. Complex 1-Co is a triple-bridging chain complex with double end-to-end SCN– anions and single gauche-bim spacers as bridges. Complexes 2-Co and 3-Mn both contain 1D chains bridged by double end-to-end SCN– or N3– anions and these chains are further extended to 2D (4,4) layers by the anti-bte spacers. Complex 4-Mn has a topological 3D diamond structure constructed through 1D double end-on azide-bridged MnII chains and extended through the anti-bim spacers. Magnetic measurements reveal that 1-Co and 3-Mn remain paramagnetic; the dominant magnetic coupling between CoII is weak ferromagnetic and that between MnII is strong antiferromagnetic. As for 2-Co and 4-Mn, they show metamagnetic behavior below TN = 2.9 and 3.0 K, respectively. Our results show that a combination of the short anion bridges (SCN–/N3–) and flexible bidentate long spacers can be used to construct coordination polymers with novel topologies and interesting magnetic properties. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)