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

doi:10.1039/C3CE41579A

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

Published Oct 8, 2013 · O. Toma, N. Mercier, M. Allain

CrystEngComm

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30

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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.

Study Snapshot

Protonated N-oxide-4,4′-bipyridine can lead to various compounds, including luminescent BiIII complexes, H-bonded dimers, and 2D square supramolecular networks.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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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