Fluorescent probe

Abstract

A compound represented by the following general formula (I): [wherein R1 and R2 represent a C1-6 alkyl group; R3, R4 and R5 represent hydrogen atom, a C1-6 alkyl group, or an aryl group; Y1 and Y2 represent —O—, —S—, —Se—, —CH═CH—, —C(R6)(R7)—, or —N(R8)— (wherein R6, R7 and R8 represent hydrogen atom or a C1-6 alkyl group); A represents a C1-3 alkylene group; n and n′ represent 0, 1 or 2; Z1 and Z2 represent a nonmetallic atom group required to form a benzo-condensed ring or a naphtho-condensed ring; L1 to L7 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.

Dependencies are inferred from the claim text.