申请人:Nagano Tetsuo
公开号:US20100285515A1
公开(公告)日:2010-11-11
A compound represented by the following general formula (I):
[wherein R
1
and R
2
represent a C
1-6
alkyl group; R
3
, R
4
and R
5
represent hydrogen atom, a C
1-6
alkyl group, or an aryl group; Y
1
and Y
2
represent —O—, —S—, —Se—, —CH═CH—, —C(R
6
)(R
7
)—, or —N(R
8
)— (wherein R
6
, R
7
and R
8
represent hydrogen atom or a C
1-6
alkyl group); A represents a C
1-3
alkylene group; n and n′ represent 0, 1 or 2; Z
1
and Z
2
represent a nonmetallic atom group required to form a benzo-condensed ring or a naphtho-condensed ring; L
1
to L
7
represent a methine group; and M
−
represents a counter ion in a number required for neutralizing electrical charge], which is useful as a fluorescent probe of which optical characteristics change depending on pH change.