Relevant and Unprecedented C-H/sigma Supramolecular Interactions Involving sigma-Aromatic M2X2 Cores

Show simple item record Sasmal, Ashok Bauzá Riera, Antonio Frontera Beccaria, Antonio Rizzoli, Corrado Desplanches, Cédric Charbonniere, Loïc J. Mitra, Samiran 2018-09-24T11:04:01Z
dc.description.abstract [eng] A novel type of C-H/σ supramolecular interaction involving σ-aromatic M2X2 (M = Cu, Hg; X = Cl, Br, I, S) cores is reported for the first time. Three new polymeric coordination copper complexes, {[Cu(μ-Cl)(Cl)- (μ-L)]2}n (1), {[Cu(μ-I)(μ-L)]2}n (2) and [Cu(Br)2(μ-L)(CH3CN)2]2 (3), have been synthesized with the organic ligand α,ω-bis(benzotriazoloxy)propane system (L) and halides as counterions. A very interesting C-H/σ supramolecular interaction has been observed in the solid state structure of compound 2, similar to a C-H⋯π interaction, which has been confirmed by Bader's "atoms-in-molecules" AIM analysis. The Nucleus Independent Chemical Shift (NICs) method was used to evaluate the aromatic character of the different cores in this study. The influence of the nature of the metal ions, bridging atoms, oxidation states, and coordination environments around the metal centers on the strength of the aromaticity of the M2X2 cores was theoretically analyzed and explained. The binding ability of the 1-alkoxy-1,2,3-benzotriazole ring to establish π-π and C-H/π interactions and how its coordination to Cu(I) and Cu(II) ions affects the strength of the aforementioned interactions have been discussed. The electron deficient triazole ring and its π-acidity increases upon coordination of the Cu ion, leading to the formation of a lone pair (lp)-π interaction involving the five-membered ring of the ligand, which has also been analyzed. We have also analyzed the C-H/σ interactions of previously reported X-ray crystal structures of different coordination polymers based on a binuclear copper(I) complex and 2,3-dimethylpyrazine, dithioethers, and benzotriazol- 1-yl-based pyridyl units as ligands using I− as a counter-ion. Complex 1 shows antiferromagnetic behavior with a magnetic coupling constant of J = −7.9 cm−1. Moreover, photoluminescence and TGA studies of the complexes were also carried out.
dc.format application/pdf
dc.relation.isformatof Versió postprint del document publicat a:
dc.relation.ispartof Dalton Transactions, 2014, vol. 43, p. 6195-6211
dc.rights (c) Sasmal, Ashok et al., 2014
dc.subject.classification 54 - Química
dc.subject.other 54 - Chemistry. Crystallography. Mineralogy
dc.title Relevant and Unprecedented C-H/sigma Supramolecular Interactions Involving sigma-Aromatic M2X2 Cores
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/acceptedVersion 2018-09-24T11:04:01Z info:eu-repo/date/embargoEnd/2075-01-01
dc.embargo 2075-01-01
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search Repository

Advanced Search


My Account