| 摘要 |
A color developer sheet which brings about color development by contact with a substantially colorless electron-donating color former, where said sheet contains an organometallic compound represented by the following general formula (I), (II) or (III) to enhance light resistance and stability of the color product obtained by the color development: <IMAGE> (I) <IMAGE> (II) <IMAGE> (III) wherein M represents a nickel atom, a copper atom, a cobalt atom, or a zinc atom; X1 and X2 each represents an oxygen atom, a sulfur atom, or -NR5-, in which R5 represents a hydrogen atom, an alkyl group, an aryl group, or a hydroxyl group; X3 represents a hydroxyl group, or a mercapto group; Y represents an oxygen atom, a sulfur atom, or -CHR6, in which R6 represents a hydrogen atom, an alkyl group, or an aryl group; R1, R2, R3 and R4 each represents a hydrogen atom, a halogen atom, a cyano group, or an alkyl, aryl, cycloalkyl or heterocyclyl group attached to the carbon atom directly or via a divalent linkage group, or at least either combination of R1 and R2 and/or R3 and R4 may be connected to each other to form a 5- or 6-membered ring together with the carbon atoms; and Z represents an organic ligand which forms a complex by binding to M via its hetero atom. |
