Advanced

Short lead(II) soaps: from weakly fluorescent crystals to strongly phosphorescent and structurally varied vitreous phases. A thermal, structural and spectroscopic study

Martinez, Francisco LU ; Ramos-Riesco, Miguel; Rodriguez-Cheda, Jose A.; Cucinotta, Fabio; Fernandez-Martinez, Alejandro; Garrido, Leoncio; Matesanz, Emilio and Marchese, Leonardo (2014) In Journal of Materials Chemistry C 2(44). p.9489-9496
Abstract
Short lead(II) alkanoates, from propionate to heptanoate, show a very intricate and reversible thermal behaviour, presenting crystalline phases and three different glass states (regular or amorphous, liquid crystal and rotator glasses) with different degrees of ordering depending on the alkyl chain length. A thorough thermal study was carried out in order to study the different phases and to analyze the thermodynamic parameters. The crystal structures of the compounds were solved by X-ray diffraction, showing similar arrangements of the 2D molecular stacking. PDF analyses of the local order in the glass structures showed shorter first neighbour lead-lead interatomic distances than in the crystalline structures. This allows establishment of... (More)
Short lead(II) alkanoates, from propionate to heptanoate, show a very intricate and reversible thermal behaviour, presenting crystalline phases and three different glass states (regular or amorphous, liquid crystal and rotator glasses) with different degrees of ordering depending on the alkyl chain length. A thorough thermal study was carried out in order to study the different phases and to analyze the thermodynamic parameters. The crystal structures of the compounds were solved by X-ray diffraction, showing similar arrangements of the 2D molecular stacking. PDF analyses of the local order in the glass structures showed shorter first neighbour lead-lead interatomic distances than in the crystalline structures. This allows establishment of a direct relationship between the structure and optical properties. Luminescence properties are, in fact, impressively enhanced in the glass states, passing from weak fluorescence at 77 K in the crystal phase to strong phosphorescence in the frozen glasses, which persists at room temperature. The high variability and the structure-property relationship described here pave the way for the design of materials with varied luminescence properties based on fine-tuning of their local structure. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry C
volume
2
issue
44
pages
9489 - 9496
publisher
Royal Society of Chemistry
external identifiers
  • wos:000344330700019
  • scopus:84908277618
ISSN
2050-7526
DOI
10.1039/c4tc01645a
language
English
LU publication?
yes
id
a9f1a185-028b-4d45-9cb4-10a56630555a (old id 4874972)
date added to LUP
2015-01-07 08:52:07
date last changed
2017-09-24 03:07:10
@article{a9f1a185-028b-4d45-9cb4-10a56630555a,
  abstract     = {Short lead(II) alkanoates, from propionate to heptanoate, show a very intricate and reversible thermal behaviour, presenting crystalline phases and three different glass states (regular or amorphous, liquid crystal and rotator glasses) with different degrees of ordering depending on the alkyl chain length. A thorough thermal study was carried out in order to study the different phases and to analyze the thermodynamic parameters. The crystal structures of the compounds were solved by X-ray diffraction, showing similar arrangements of the 2D molecular stacking. PDF analyses of the local order in the glass structures showed shorter first neighbour lead-lead interatomic distances than in the crystalline structures. This allows establishment of a direct relationship between the structure and optical properties. Luminescence properties are, in fact, impressively enhanced in the glass states, passing from weak fluorescence at 77 K in the crystal phase to strong phosphorescence in the frozen glasses, which persists at room temperature. The high variability and the structure-property relationship described here pave the way for the design of materials with varied luminescence properties based on fine-tuning of their local structure.},
  author       = {Martinez, Francisco and Ramos-Riesco, Miguel and Rodriguez-Cheda, Jose A. and Cucinotta, Fabio and Fernandez-Martinez, Alejandro and Garrido, Leoncio and Matesanz, Emilio and Marchese, Leonardo},
  issn         = {2050-7526},
  language     = {eng},
  number       = {44},
  pages        = {9489--9496},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Materials Chemistry C},
  title        = {Short lead(II) soaps: from weakly fluorescent crystals to strongly phosphorescent and structurally varied vitreous phases. A thermal, structural and spectroscopic study},
  url          = {http://dx.doi.org/10.1039/c4tc01645a},
  volume       = {2},
  year         = {2014},
}