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Browse Prior Art Database

Photosensitive Conductive Material

IP.com Disclosure Number: IPCOM000077385D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 32K

Publishing Venue

IBM

Related People

Anschel, M: AUTHOR [+2]

Abstract

The synthesis of 7,7,8,8-tetracyanoquinodimethan (TCNQ) and its conductive properties in combination with certain bases are described in the Journal of the American Chemical Society, 84, 3370 through 3387 (1962).

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Photosensitive Conductive Material

The synthesis of 7,7,8,8-tetracyanoquinodimethan (TCNQ) and its conductive properties in combination with certain bases are described in the Journal of the American Chemical Society, 84, 3370 through 3387 (1962).

A particularly conductive polymer is formed by TCNQ and 4, 4-methylene bis (N, N-dimethylaniline). This TCNQ-Lewis base combination may be abbreviated as (TCNQ) (MNDA). If the TCNQ and MNDA constituents are dissolved in an appropriate solvent with the dimethyl sulfoxide complex of palladium chloride (PdCl(2) - 2DMSO), there results an electrically conductive material which has longer shelf life, but can be rendered nonconductive quickly when exposed to actinic radiation.

2,5-cyclohexadiene delta 1, infinity: 4, infinity' -dimalononitrile [7,7,8, 8- tetracyanoquinodimethan, (TCNQ)] in acetone is reacted with a combined mixture of 4,4'-methylene bis (N,N-dimethylaniline) dissolved in acetone and the dimethyl sulfoxide complex of palladium chloride (PdCl -2DMSO), to give a conductive charge transfer complex. The reactants are refluxed for 15 minutes with constant stirring, cooled, the solvents stripped off under vacuum and the product collected. The material is then placed on a suitable nonconductive substrate, covered with an appropriate mask and exposed to UV radiation. The masked areas will retain conductivity and unreacted PdCl(2).2DMSO and the substrate with its coating can be subjected to electroless deposition. A metallic (e.g., copper) deposit outlined by the conductive pattern can thus be formed, utilizing an electroless plating solution without use of a separate precharging catalyst. Evidently the palladium provides the sites for the metal deposition.

The proposed general mechanism for the reaction of TCNQ(I) and 4,4'- methylene bis (N,N-dimethylaniline) (MNDA) (II) is given...