Journal article
Structure and photoluminescence of silver(i) trinuclear halopyrazolato complexes
Dalton transactions (Cambridge, England : 2003), Vol.43(42), pp.15915-15928
2014
Abstract
Five halogen substituted pyrazolates, 4-chloro-3,5-diisopropylpyrazole (4-Cl-3,5-iPr2pzH), 4-bromo-3,5-diisopropylpyrazole (4-Br-3,5-iPr2pzH), 4-iodo-3,5-diisopropylpyrazole (4-I-3,5-iPr2pzH), 4-chloro-3,5-diphenylpyrazole (4-Cl-3,5-Ph2pzH), and 4-bromo-3,5-diphenylpyrazole (4-Br-3,5-Ph2pzH), were conveniently prepared by halogenation of the appropriate pyrazoles with N-halosuccinimides (NXS) (X = Cl, Br, and I) followed by complexation of the pyrazolate anions with silver(i) nitrate. Single crystal X-ray analysis revealed either dimeric trinuclear {[Ag(μ-4-X-3,5-R2pz)]3}2 (R = iPr, X = Cl, Br, and I) or trinuclear [Ag(μ-4-X 3,5-R2pz)]3 (R = iPr, X = I; R = Ph, X = Cl, R = Ph, X = Br) structures, the latter held together with argentophilic interactions (Ag⋯Ag interactions) that could also be observed in the Raman spectra. The electronegativity of the halogen substituent could be correlated with the strength of the Ag⋯Ag interaction and the wavelength of solid-state photoluminescence. All complexes were emissive on UV irradiation at low temperatures, with the colour of emission from the diisopropyl substituted analogues red shifted by the halogens in the order Cl (red) > Br (orange) > I (yellow). Emission from the diphenyl substituted analogues was dominated by the extended aromatic system and was largely invariant to the halogens. © the Partner Organisations 2014.
Details
- Title
- Structure and photoluminescence of silver(i) trinuclear halopyrazolato complexes
- Authors
- Y Morishima (Author) - Ibaraki University, JapanDavid James Young (Author) - Monash University, MalaysiaK Fujisawa (Author) - Ibaraki University, Japan
- Publication details
- Dalton transactions (Cambridge, England : 2003), Vol.43(42), pp.15915-15928
- Publisher
- Royal Society of Chemistry (R S C) Publications
- Date published
- 2014
- DOI
- 10.1039/c4dt01978d
- ISSN
- 1477-9226
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99449912302621
- Output Type
- Journal article
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