TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The methine dye is prepared by reacting 1-bromocyclopenta-1,3-diene derivative of formula (3) and borate compound of formula (4), obtaining 3-(cyclopenta-1,3-dien-1-yl)prop-2-enal compound of formula (5), processing 3-(cyclopenta-1,3-dien-1-yl)prop-2-enal compound using N-iodosuccinimide, obtaining 2-bromocyclopenta-1,3-diene derivative of formula (6), reacting 2-bromocyclopenta-1,3-diene derivative and borate compound of formula (7), obtaining 3-bromo-1-ethenylcyclopenta-1,3-diene derivative of formula (8), reacting 3-bromo-1-ethenylcyclopenta-1,3-diene derivative with boronic acid of formula (9), obtaining carbonyl compound of formula (10), reacting carbonyl compound with methylene compound of formula: H2C(-X1)(-Y1) (11), and obtaining methine dye. Preferred Component: The methine dye is preferably (2E)-3-(5-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-3-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2-cyanoprop-2-enoic acid, (2E)-3-(5-(5-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-3-(5-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2-cyanoprop-2-enoic acid, (2E)-3-(5-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-2-(5-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-3-yl)thiophen-2-yl)-2-cyanoprop-2-enoic acid, or (2E)-3-(5-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-2-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)-3-hexylthiophen-2-yl)thiophen-3-yl)-4-hexylthiophen-2-yl)-2-cyanoprop-2-enoic acid. Preferred Definitions:    X1,Y1,X2,Y2=group chosen from groups of formulae (1002)-(1007);    X1+Y1,X2+Y2=ring structure chosen from groups of formulae (2001)-(2005);and    R2=group of formula (3107) or (3111).    EXAMPLE - 20 Parts mass 2,3-dibromothiophene, 31 parts mass 5-formyl-2-thiophene boronic acid, 1.7 parts mass bis(tri-tert-butylphosphine)palladium(0), 50 parts mass cesium fluoride, 112 parts mass water were added to 516 parts mass 1,4-dioxane, to obtain a mixture. The obtained mixture was reacted at 80 degrees C for 3 hours. The reacted mixture was separated using chloroform and water. The chloroform phase was purified by column chromatography, after concentrating, to obtain (2E)-3-(5-(5-(4-(bis(9,9-dibutyl-9H-fluoren-2-yl)amino)phenyl)-3-(5-((1E)-2-carboxy-2-cyanoeth-1-en-1-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-2-cyanoprop-2-enoic acid as yellow solids.