Correlation between Metal-Insulator Transition and Hydrogen-Bonding Network in the Organic Metal delta-(BEDT-TTF)(4)[2,6-Anthracene-bis(sulfonate)]center dot(H2O)(4)
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
CRYSTAL GROWTH & DESIGN
ISSN
1528-7483
EISSN
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2013
Numer zeszytu
11
Strony od-do
5135-5145
Numer tomu
13
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+ 10
Streszczenia
Język
en
Treść
The of electronic of sensitivity properties organic conductors to minute modifications of their solid-state structure is investigated here within BED T-TTF (ET) salts with organic bis-sulfonate anions, where specific hydrogen bonds between and water molecules sulfonate moieties are shown to dynamically control the organic slabs' electronic structure. While the mixed-valence, 2,6-naphthalene-bis(sulfonate) salt, (ET)(4)(NBS)center dot 4H(2)O, exhibits a charge order state already at room temperature, the corresponding salt with the 2,6-anthracene-bis(sulfonate) dianion, formulated as (ET)(4)(ABS)center dot 4H(2)O, is metallic at RT and exhibits a metal-insulator transition at T-MI = 85 K. The origin of the MI transition is revealed from a combination of temperature-dependent spectroscopic (Raman) measurements, X-ray structure elucidations (from 300 to 15 K), and theoretical investigations, demonstrating that the charge disproportionation observed below T-MI is associated here with the progressive switching of bifurcated OH center dot center dot center dot O hydrogen bonds between the sulfonate moieties of the anion and the trapped water molecules. These movements within the anion layer are transmitted through weaker C-H center dot center dot center dot O interactions to the two A and B donor molecules, modifying the details of the overlap interactions within AA and BB pairs and opening a gap in the band structure.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
607840
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