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2009 ; 10
(2
): 024301
Nephropedia Template TP
Sci Technol Adv Mater
2009[Apr]; 10
(2
): 024301
PMID27877274
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The synthesis, structure and properties of tetrathiapentalene-based (TTP) organic
conductors are reviewed. Among various TTP-type donors, bis-fused
tetrathiafulvalene, 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene
(BDT-TTP) and its derivatives afford many metallic radical cation salts stable
down to low temperatures, regardless of the size and shape of the counter anions.
Most BDT-TTP conductors have a ?-type donor arrangement with almost uniform
stacks. Introduction of appropriate substituents results in molecular packing
that differs from the ?-type. A vinylogous TTP,
2-(1,3-dithiol-2-ylidene)-5-(2-ethanediylidene-1,3-dithiole)-1,3,4,6-tetrathiapentalene
(DTEDT) has yielded an organic superconductor (DTEDT)(3)Au(CN)(2) as well as
metallic radical cation salts, regardless of the counter anions. (Thio)pyran
analogs of TTP, namely (T)PDT-TTP and its derivatives produce molecular
conductors with novel molecular arrangements. A TTP analog with reduced
?-electron system 2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene
(BDA-TTP) has afforded several organic superconductors. Highly conducting
molecular metals with unusual oxidation states (+1, +5/3 and neutral) have been
developed on the basis of
2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (BDT-TTP) derivatives
and analogous metal derivatives M(dt)(2) (M = Ni, Au).
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