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Solvent-driven azide-induced mononuclear discrete versus one-dimensional polymeric aromatic Möbius cadmium(ii) complexes of an N6 tetradentate helical ligand

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Akbari Afkhami, Farhad [University of Alabama] Mahmoudi, Ghodrat [University of Maragheh] Gurbanov, Atash V. [RUDN University] Zubkov, Fedor I. [Baku State University] Qu, Fengrui [University of Alabama] Safin, Damir A. [UCL]

We report the synthesis and structural characterization of a heteroleptic mononuclear discrete complex [Cd(N3)2(L)(MeOH)]·MeOH (1·MeOH) and a one-dimensional coordination polymer of the composition [Cd3(N3)6(L)]n (2), fabricated from Cd(NO3)2·4H2O and the helical organic ligand benzilbis((pyridin-2-yl)methylidenehydrazone) (L) in the presence of two equivalents of NaN3. The formation of different structures is driven by the solvent. The former complex is formed in the presence of MeOH, while the latter complex is formed in EtOH. The CdII centre in 1·MeOH is trapped by the two pyridyl-imine units of the tetradentate ligand L, two azide ligands and one oxygen atom of one methanol ligand with the CdN6O coordination polyhedron yielding a square face monocapped trigonal prism. The asymmetric unit of 2 consists of three symmetrically independent atoms of CdII, six azide anions and one L. The polymeric structure of 2 is realized through chains of the Cd(N3)2 units which are decorated with Cd(N3)2L units. The CdII atoms from the backbone of the coordination polymer have a distorted octahedral coordination, while the remaining CdII atom forms a trigonal prism with two basal planes nearly parallel to each other. In both complexes, the 12π electron chelate ring of the CdL fragment is shown to be aromatic by establishing it as a Möbius object. Hirshfeld surface analysis of 1 in 1·MeOH and L in 2 showed that the structures of both species are highly dominated by H⋯X (X = H, C and N) contacts, of which the latter two are highly favoured, as well as some contribution from highly enriched C⋯C contacts is clearly observed.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2017
Language Anglais
Journal information "Dalton Transactions" - Vol. 46, no.43, p. 14888-14896 (2017)
Publisher Royal Society of Chemistry (RSC)
issn 1477-9226
e-issn 1477-9234
Publication status Publié
Affiliation UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity
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Bibliographic reference Akbari Afkhami, Farhad ; Mahmoudi, Ghodrat ; Gurbanov, Atash V. ; Zubkov, Fedor I. ; Qu, Fengrui ; et. al. Solvent-driven azide-induced mononuclear discrete versus one-dimensional polymeric aromatic Möbius cadmium(ii) complexes of an N6 tetradentate helical ligand. In: Dalton Transactions, Vol. 46, no.43, p. 14888-14896 (2017)
Permanent URL http://hdl.handle.net/2078.1/202048