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Ghosh B.N.,University of Jyvaskyla | Ghosh B.N.,National Institute of Science Education and Research NISER Bhubaneswar | Lahtinen M.,University of Jyvaskyla | Kalenius E.,University of Jyvaskyla | And 2 more authors.
Crystal Growth and Design | Year: 2016

Three new organometallic trimethylplatinum(IV) iodide complexes of 2,2′:6′,2-terpyridines have been synthesized and characterized by 1H NMR spectroscopy, mass spectrometry, elemental analysis, and single crystal X-ray diffraction analysis. The X-ray crystal structures of PtMe3I(L) complexes 1-3 {L for 1 = 4′-chloro-2,2′:6′,2-terpyridine, 2 = 4′-(4-cyanophenyl)-2,2′:6′,2-terpyridine, and 3 = 4′-(4-tolyl)-2,2′:6′,2-terpyridine} reveal distorted octahedral coordination geometry of the platinum(IV) metal centers with bidentate coordination of the terpyridine ligands. Complexation of 1-3 with iodopentafluorobenzene (IPFB) afforded single-crystal structures of halogen bond (XB) complexes 1a-3a, in which the Pt-complexes act as bifunctional XB bond acceptor wherein the pendant pyridine nitrogen atom and the platinum bound iodine atom act as XB acceptors toward the polarized iodine of IPFB. In addition, complexation of 1 with 1,4-diiodotetrafluobenzene (DITFB) afforded single-crystal structure of dimeric XB complex (1b), in which the halogen bonding occurs via the pyridine nitrogen atoms of two 1 and DITFB, whereas the iodine on each Pt-complex forms weak hydrogen bond with solvent molecule (chloroform). © 2016 American Chemical Society. Source


Maiti S.,National Institute of Science Education and Research NISER Bhubaneswar | Mal P.,National Institute of Science Education and Research NISER Bhubaneswar
Advanced Synthesis and Catalysis | Year: 2015

A transition metal-free, hypervalent iodine(III) reagent [phenyliodine diacetate (PIDA)]-mediated C(sp2)-H amidation in trifluoroethanol (TFE) has been developed. The intramolecular coupling methodology presented here provides a direct access to 1,2-disubstituted multifunctional benzimidazoles in good to excellent yields. The reactions were performed in the open air and at ambient temperature, and were found to be eco-friendly and atom-economical. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Giri C.,National Institute of Science Education and Research NISER Bhubaneswar | Giri C.,University of Jyvaskyla | Sahoo P.K.,National Institute of Science Education and Research NISER Bhubaneswar | Puttreddy R.,University of Jyvaskyla | And 2 more authors.
Chemistry - A European Journal | Year: 2015

Subcomponent self-assembly from components A, B, C, D, and Fe2+ under solvent-free conditions by self-sorting leads to the construction of three structurally different metallosupramolecular iron(II) complexes. Under carefully selected ball-milling conditions, tetranuclear [Fe4(AD2)6]4- 22-component cage 1, dinuclear [Fe2(BD2)3]2- 11-component helicate 2, and 5-component mononuclear [Fe(CD3)]2+ complex 3 were prepared simultaneously in a one-pot reaction from 38 components. Through subcomponent substitution reaction by adding subcomponent B, the [Fe4(AD2)6]4- cage converts quantitatively to the [Fe2(BD2)3]2- helicate, which, in turn, upon addition of subcomponent C, transforms to [Fe(CD3)]2+, following the hierarchical preference based on the thermodynamic stability of the complexes. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Achar T.K.,National Institute of Science Education and Research NISER Bhubaneswar | Maiti S.,National Institute of Science Education and Research NISER Bhubaneswar | Mal P.,National Institute of Science Education and Research NISER Bhubaneswar
Organic and Biomolecular Chemistry | Year: 2016

Iodinium cation (I+ or IOAc) was produced from the combination of phenyliodine diacetate (PIDA) and iodine. I+ facilitated the direct vicinal difunctionalization of olefins to α-azido, α-trideuteriomethoxy, α-2,2,2-trifluoroethoxy and α-acyloxy alkyl iodides via cation-π interaction at room temperature and under transition-metal free conditions. © The Royal Society of Chemistry 2016. Source


Sahoo P.K.,National Institute of Science Education and Research NISER Bhubaneswar | Giri C.,National Institute of Science Education and Research NISER Bhubaneswar | Giri C.,University of Jyvaskyla | Haldar T.S.,National Institute of Science Education and Research NISER Bhubaneswar | And 3 more authors.
European Journal of Organic Chemistry | Year: 2016

The described mechanochemical methodology is an example of a proof-of-concept in which solution-based tedious, poor yielding, and difficult syntheses of pyrazaacenes are achieved under solvent-free ball-milling conditions; the method is easy, high yielding, time-efficient, and environmentally benign. The synthesized compounds also include pyrazaacenes (N-heteroacenes) that are octacene analogues containing pyrene building blocks. The compounds were sparingly soluble in common solvents, and column chromatographic purifications could be avoided after the solvent-free syntheses. The UV/Vis absorption spectra of the pyrazaacenes show intense absorption bands in the near-IR region. The single-crystal X-ray analyses of selected pyrazaacene derivatives showed pairwise π-π interactions and some C-H⋯π interactions, which could account for some of the photophysical features of the compounds in the solid state. Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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