Organic dye for recording layer and high density optical recording medium using the same

A preparation method for a dye having a following general chemical structural formula:

• wherein n is an integer of 0 or 1, X represents oxygen atom or C(CN)2, A represents substituted or non-substituted cyclic alkyl group and R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 represent hydrogen atom, halogen atom, alkyl group with carbon number 1-18 (C1-18), alkoxy group with carbon number 1-18 (C1-18), carboxyl group with carbon number 1-18 (C1-18), amino group, substituted amino group, alkyl ester group with carbon number 1-18 (C1-18), carboxyl group with carbon number 1-18 (C1-18), benzene including amino group or carboxyl group, nitro group, adamantyl carbonyl group, adamantyl group, alkenyl group, alkynyl group, amino group, azo group, aryl group, aryloxy group, arylcarbonyl group, aryloxycarbonyl group, arylcarbonyloxy group, aryloxycarbonyloxy group, alkylcarbonyl group, alkylcarbonyloxy group, alkoxycarbonyloxy group, alkoxycarbonyl group, carbamoyl group, cyanate group, cyano group, formyl group, formyloxy group, heterocyclic group, isothiocyanate group, isocyano group, isocyanate group, nitroso group, perfluoroalkyl group, perfluoroalkoxy group, sulfinyl group, sulfonyl group, silyl group, or thiocyanate group,
• wherein the preparation method comprises following steps:
• dissolving a starting material (c) having a following formula:
• and N,N-dialkylaminolbenzaldehyde in methanol to form a mixture solution, wherein for the starting material (c), A represents substituted or non-substituted cyclic alkyl group, X represents oxygen atom or C(CN)2;
• refluxing the mixture solution until the reaction is completed;
• and
• filtering the mixture solution to obtain the dye.