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Issue 42, 2013
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Protonated N-oxide-4,4′-bipyridine: from luminescent BiIII complexes to hybrids based on H-bonded dimers or H-bonded open 2D square supramolecular networks

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Abstract

The N-oxide-4,4′-bipyridine (bp4mo) ligand has been rarely used in coordination or supramolecular chemistry. Depending on experimental conditions in the bp4mo/BiX3 (X = Cl, Br) system, several compounds, in which the degree of protonation of bp4mo (τ = H/bp4mo) varies, have been stabilized. In acidic conditions, either a complete N-protonation and a partial O-protonation (τ = 1.5) or a complete N-protonation (τ = 1.0) can occur, leading to either a hybrid salt based on H-bonded dimers [H(Hbp4mo)2]3+, or to O(Hbp4mo)–Bi photoluminescent complexes. In neutral conditions, a partial N-protonation (τ = 0.5) occurs in [H(bp4mo)2][BiCl4]. Although the N-oxide parts are free to bind Bi3+ cations, the organic entities prefer self-organizing through H-bonding (NH⋯N and CH⋯O) to give an impressive 2D supramolecular square network which accommodates the 1D BiCl4 polymeric anion.

Graphical abstract: Protonated N-oxide-4,4′-bipyridine: from luminescent BiIII complexes to hybrids based on H-bonded dimers or H-bonded open 2D square supramolecular networks

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Supplementary files

Article information


Submitted
08 Aug 2013
Accepted
12 Sep 2013
First published
12 Sep 2013

CrystEngComm, 2013,15, 8565-8571
Article type
Paper

Protonated N-oxide-4,4′-bipyridine: from luminescent BiIII complexes to hybrids based on H-bonded dimers or H-bonded open 2D square supramolecular networks

O. Toma, N. Mercier, M. Allain and C. Botta, CrystEngComm, 2013, 15, 8565
DOI: 10.1039/C3CE41579A

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