Free Access
| Issue |
Microsc. Microanal. Microstruct.
Volume 6, Number 5-6, October / December 1995
|
|
|---|---|---|
| Page(s) | 545 - 550 | |
| DOI | https://doi.org/10.1051/mmm:1995146 | |
Microsc. Microanal. Microstruct. 6, 545-550 (1995)
DOI: 10.1051/mmm:1995146
Polymorphism in the
Antonella Ciccarese1, Dore Augusto Clemente2, Armando Marzotto3 et Cesare Pecile4
1 Dipartimento di Biologia, Università di Lecce, Via Monteroni, 73100 Lecce, Italy
2 Dipartimento di Ingegneria dei Materiali e Chimica Applicata, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy
3 Dipartimento di Chimica Inorganica, Metallorganica ed Analitica, Università di Padova, Via Loredan 4, 35131 Padova, Italy
4 Dipartimento di Chimica Fisica, Università di Padova, Via Loredan 2, 35131 Padova, Italy
6150K - Crystallographic aspects of polymorphic and order disorder transformations.
7215N - Collective modes: low dimensional conductors.
6165 - Crystal structure of specific organic compounds.
6150L - Crystal binding.
Key words
charge exchange -- crystal structure -- electrical resistivity -- hydrogen bonds -- organic compounds -- polymorphism -- synthetic metals -- TTF sub 2 TCNE sub 2 -- charge transfer complex -- polymorphism -- tetrathiafulvalene -- tetracyanoethylene -- molecular structure -- stack structure -- crystal structure -- hydrogen bonding -- lamellar sheets -- resistivity -- C S bond length -- 1E9 ohmcm
© EDP Sciences 1995
DOI: 10.1051/mmm:1995146
Polymorphism in the
![$\bf [(TTF)_2(TCNE)_2]$](/articles/mmm/abs/1995/05/mmm_1995__6_5-6_545_0/img1.gif)
Charge-Transfer Complex
Antonella Ciccarese1, Dore Augusto Clemente2, Armando Marzotto3 et Cesare Pecile4 1 Dipartimento di Biologia, Università di Lecce, Via Monteroni, 73100 Lecce, Italy
2 Dipartimento di Ingegneria dei Materiali e Chimica Applicata, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy
3 Dipartimento di Chimica Inorganica, Metallorganica ed Analitica, Università di Padova, Via Loredan 4, 35131 Padova, Italy
4 Dipartimento di Chimica Fisica, Università di Padova, Via Loredan 2, 35131 Padova, Italy
Abstract
The reaction between tetrathiafulvalene (TTF) and
tetracyanoethylene (TCNE) yields two polymorphs (
and 
) both
having formula
![$\rm [(TTF)_2^{2\delta +}(TCNE)_2^{2\delta -}]$](/articles/mmm/abs/1995/05/mmm_1995__6_5-6_545_0/img4.gif){kind=small}
with similar molecular
structure. Both polymorphs display a stack structure of the type
(TTF-TTF)(TCNE-TCNE)(TTF-TTF)
(TCNE-TCNE) but they differ in crystal
structure for hydrogen bonding system and lamellar sheets.
These two CT complexes
possess an high resistivity (
.cm) and a degree of
charge-transfer of
estimated through the C-S bond
length.
6150K - Crystallographic aspects of polymorphic and order disorder transformations.
7215N - Collective modes: low dimensional conductors.
6165 - Crystal structure of specific organic compounds.
6150L - Crystal binding.
Key words
charge exchange -- crystal structure -- electrical resistivity -- hydrogen bonds -- organic compounds -- polymorphism -- synthetic metals -- TTF sub 2 TCNE sub 2 -- charge transfer complex -- polymorphism -- tetrathiafulvalene -- tetracyanoethylene -- molecular structure -- stack structure -- crystal structure -- hydrogen bonding -- lamellar sheets -- resistivity -- C S bond length -- 1E9 ohmcm
© EDP Sciences 1995