Provided is a sulfonic acid ester compound represented by formula (1).
(In the formula, R
1
and R
2
each independently represent a hydrogen atom, or a straight-chain or branched monovalent aliphatic hydrocarbon group. R
3
represents a straight-chain or branched monovalent aliphatic hydrocarbon group. The sum of the carbon numbers of R
1
, R
2
and R
3
is 6 or greater. A
1
represents —O— or —S—. A
2
represents an aromatic group having a valence of (n+1). A
3
represents a hydrocarbon group which has a valence of m, and is unsubstituted or has a substituent that contains one or more aromatic rings. m represents an integer satisfying 2≤m≤4. n represents an integer satisfying 1≤n≤4.)
An aniline derivative represented by formula (1) is provided.
[In formula (1), R
1
to R
5
are each independently a hydrogen atom or a group represented by formula (2) or (3)
(wherein Ar
1
and Ar
2
each independently represent a C
6-20
aryl group and Ar
3
represents a C
6-20
arylene group, any two of Ar
1
to Ar
3
may be bonded to each other to form a ring in cooperation with the nitrogen atom, R
6
to R
8
each independently represent a C
1-20
alkyl or C
6-20
aryl group optionally substituted by W
1
, and W
1
represents a halogen atom, a nitro group, a C
1-20
alkoxy group, or a cyano group), at least one of R
1
to R
5
being a group represented by formula (3).]
Provided is an electron-accepting substance precursor comprising a sulfonic acid ester compound represented by formula (1).
(In the formula, R1-R4 each independently represent a hydrogen atom, or a straight-chain or branched C1-6 alkyl group. R5 represents a C2-20 monovalent hydrocarbon group which may be substituted. A1 represents —O— or —S—. A2 represents a group having a valence of (n+1) and derived from naphthalene or anthracene. A3 represents a group having a valence of m and derived from perfluorinated biphenyl. m represents an integer satisfying 2≤m≤4. n represents an integer satisfying 1≤n≤4).
Provided is a charge-transporting varnish that contains: (A) an aryl sulfonate ester compound; (B) a tertiary aryl amine compound having at least one nitrogen atom, and for which the nitrogen atom has a tertiary aryl amine structure; and (C) an organic solvent.
Provided is a sulfonic acid ester compound which is represented by formula (1).
(In the formula, each of R
1s
-R
5s
independently represents a hydrogen atom, a nitro group, a cyano group, a halogen atom, an alkyl group, a halogenated alkyl group or a halogenated alkenyl group; each of R
6s
-R
9s
independently represents a hydrogen atom or a linear or branched monovalent aliphatic hydrocarbon group; R
10s
represents a linear or branched monovalent aliphatic hydrocarbon group or —OR
11s
, wherein R
11s
represents an optionally substituted monovalent hydrocarbon group having 2-20 carbon atoms; A
1
represents —O—, —S— or —NH—; A
2
represents an (n+1)-valent aromatic group; and n represents an integer that satisfies 1≤n≤4.)