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Issue 32, 2018
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From monomeric complexes to double-stranded helicates constructed around trans-TiO4N2 motifs with intramolecular inter-ligand hydrogen-bonding interactions

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Abstract

A coordination chemistry involving trans-TiO4N2 motifs is described, where the oxygen ligands are 2,2′-biphenolato derivatives (L1 or L2) and the nitrogen ligands are pyridine (Pyr), 2,3-dihydro-7-azaindole (DHA) or 2-(methylamino)pyridine (MePyr). Monomeric complexes and double-stranded helicates incorporating this set of ligands are characterized. The monomeric species are obtained from the precursor [Ti(L1)2(HOiPr)2] whereas the helical dinuclear architectures are synthesized following a multicomponent self-assembly approach starting from L2H4, Ti(OiPr)4 and two equivalents of the nitrogen ligand. It is proposed that the trans isomerism in TiO4N2 observed in these structures results from the destabilisation of the cis isomer by the trans influence of the Ti–N bonds. The crystal structures and infra-red analysis demonstrate hydrogen bonding interactions occurring between the NH group of DHA or MePyr and the oxygens belonging to the titanium coordination sphere. The strength of these interactions is estimated using the PACHA (Partial Atomic Charges Analysis) software.

Graphical abstract: From monomeric complexes to double-stranded helicates constructed around trans-TiO4N2 motifs with intramolecular inter-ligand hydrogen-bonding interactions

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Publication details

The article was received on 06 Apr 2018, accepted on 09 Jul 2018 and first published on 25 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT01343H
Citation: Dalton Trans., 2018,47, 11113-11122
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    From monomeric complexes to double-stranded helicates constructed around trans-TiO4N2 motifs with intramolecular inter-ligand hydrogen-bonding interactions

    G. Khalil, L. Barloy, N. Kyritsakas, P. Mobian and M. Henry, Dalton Trans., 2018, 47, 11113
    DOI: 10.1039/C8DT01343H

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