Electrically conductive complex

An electrically conductive complex which comprises (a) a thia- and/or selenafulvalenyl group-containing compound as an electron donor and (b) an electron acceptor, the complex having an electron donor/electron acceptor molar ratio of 1/0.1 to 1/10, said thia- and/or selenafulvalenyl group-containing compound having the formula (I) ##STR29## wherein:

• each of X.sub.1, X.sub.2, X.sub.3, X.sub.4, X'.sub.1, X'.sub.2, X'.sub.3 and X'.sub.4 is independently S or Se,
• Y is selected from the group consisting of a lower alkyl group having 1 to 5 carbon atoms, a lower alkoxy group having 1 to 5 carbon atoms, a thio lower alkyl group having 1 to 5 carbon atoms, an amino group, a hydroxyl group, a halogen atom, a cyano group and a nitro group, said Y having a size which is not so large as to prevent molecular overlapping,
• m is an integer of 0 to 4,
• each of Z.sub.1, Z.sub.2, Z'.sub.1, and Z'.sub.2 is independently a hydrogen atom, C.sub.n H.sub.2n+1 in which n is an integer of 1 to 5, or XC.sub.n H.sub.2n+1 in which X is S or Se and n is an integer of 1 to 5, or a combination of Z.sub.1 and Z.sub.2 or a combination of Z'.sub.1 with Z'.sub.2 are C.sub.n H.sub.2n in which n is an integer of 1 to 5, or X(C.sub.n H.sub.2n).sub.n' X in which X is S or Se and n' is an integer of 1 to 3, and
• each of R.sub.1, R.sub.2, R.sub.3, R'.sub.1, R'.sub.2 and R'.sub.3 is independently a hydrogen atom or C.sub.n H.sub.2n+1 in which n is an integer of 1 to 5,
• wherein said electron acceptor (b) is an organic electron acceptor selected from the group consisting of:
• 7. 7,8,8-tetracyanoquinodimethane,
• 2-methyl-7,7,8,8-tetracyanoquinodimethane, 2,5-dimethyl-7,7,8,8-tetracyanoquinodimethane, 2,5-diethyl-7,7,8,8-tetracyanoquinodimethane, 2-methoxy-7,7,8,8-tetracyanoquinodimethane, 2,5-dimethoxy-7,7,8,8-tetracyanoquinodimethane, 2-methoxy-5-ethoxy-7,7,8,8-tetracyanoquinodimethane, 2-methoxydihydrodioxabenzo-7,7,8,8-tetracyanoquinodimethane, 2-chloro-7,7,8,8-tetracyanoquinodimethane, 2-bromo-7,7,8,8-tetracyanoquinodimethane, 2,5-dibromo-7,7,8,8-tetracyanoquinodimethane, 2,5-diiodo-7,7,8,8-tetracyanoquinodimethane, 2-chloro-5-methyl-7,7,8,8-tetracyanoquinodimethane, 2-bromo-5-methyl-7,7,8,8-tetracyanoquinodimethane, 2-iodo-5-methyl-7,7,8,8-tetracyanoquinodimethane, 11,11,12,12-tetracyano-2,6-naphthoquinodimethane, 1,1,2,3,4,4-hexacyanobutadiene, sodium-13,13,14,14-tetracyanodiphenoxydimethane, tetracyanoethylene, o-benzoquinone, p-benzoquinone, 2,6-naphthoquinone, diphenoquinone, tetracyanodiquinone, p-fluoranil and tetrachlorodiphenoquinone or,
• an inorganic electron acceptor selected from the group consisting of halogen atoms, trihalide anions, SCN.sup.-, Cu(NCS).sub.2, AuI.sub.2, AuBr.sub.2, AuCl.sub.2, ClO.sub.4, PF.sub.6 and BF.sub.4.