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Preparation and Single Crystal Growth of Tetrathiafulvalinium Tetracyanoquinodimethan

IP.com Disclosure Number: IPCOM000080386D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+4]

Abstract

The charge transfer complex salt between tetrathiafulvalene, C(6)H(4)S(4) (TTF) and 7,7,8,8-tetracyanoquinodimethan, C(12)H(4)N(4) (TCNQ) is the most highly conducting known organic solid. This charge transfer complex salt, which is denoted by the symbol TTF . TCNQ, has been found to display a conductivity maximum delta(max) approx./- 10/6/ ohm cm)/-1/ at its Peieris phase transition point T(c) approx. 60 degrees C, which is believed to be due to observed in only a few crystals which have been grown from acetonitrile solutions. Generally, it has been found that such solution growth results in small crystals, only a few of which exhibit regular faceting and high-conducting properties.

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Preparation and Single Crystal Growth of Tetrathiafulvalinium Tetracyanoquinodimethan

The charge transfer complex salt between tetrathiafulvalene, C(6)H(4)S(4) (TTF) and 7,7,8,8-tetracyanoquinodimethan, C(12)H(4)N(4) (TCNQ) is the most highly conducting known organic solid. This charge transfer complex salt, which is denoted by the symbol TTF . TCNQ, has been found to display a conductivity maximum delta(max) approx./- 10/6/ ohm cm)/-1/ at its Peieris phase transition point T(c) approx. 60 degrees C, which is believed to be due to observed in only a few crystals which have been grown from acetonitrile solutions. Generally, it has been found that such solution growth results in small crystals, only a few of which exhibit regular faceting and high-conducting properties.

There is described herein a method of TTF TCNQ preparation. In this connection, reference is made to the figure wherein there is illustrated an evacuated (10-20 mu Hg pressure of N(2)) PYREX* tube 10, which contains highly purified TTF and TCNQ reactants. These reactants are reacted in a furnace 12 having a thermal gradient. The TCNQ, source 14, is maintained at a temperature of 160-200 degrees C. The TTF, source 16, is maintained at a temperature of 90-120 degrees C. A temperature gradient of 3 degrees C/cm is employed in furnace 12.

In the reaction, the higher vapor pressure TTF diffuses against the thermal gradient, and the two source temperatures are adjustable to control the reaction rate.

With...