TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation - No general preparation given. Preferred Composition: The acceptor site (T) is of formula (I) or (II), and contains a donor site (D) which has electron-donating skeleton at the terminal on the opposite side to the anchor site (A), and spacer site (Q) which has pi-conjugation skeleton between the donor sites (D). The donor site (D) is triarylamine derivative or carbazole derivative optionally substituted by aryl, amino, aryl alkoxy or arylthio alkoxy group.Ar1,Ar2=groups derived from benzene, heterole, heterole oxide, benzo heterole, benzo heterole oxide, dibenzo heterole, dibenzo heterole oxide, fluorene derivative, dithieno heterole, dithieno heterole oxide, thieno heterole, thieno heterole oxide, benzodi heterole, benzodi heterole oxide, acene, thiazole, benzothiazole, benzobis thiazole, oxazole, benzothiadiazole, imidazole, pyrazole, pyridine, pyrimidine, pyridazine, quinoline, or isoquinoline;or Ar1+Ar2=ring;R1,R2=carbon, nitrogen or phosphorus, where at least one of nitrogen or phosphorus coordinates with boron;R'1=nitrogen or phosphorus;R3=carbon which couple with anchor site (A);X,X1,X2=H, halo, alkyl, aryl, heteroaryl, alkenyl, alkynyl, amino, alkoxy, aryl alkoxy or hydroxy;or X1+X2=2,2'-biphenyl or optionally substituted 2,2'-bithienyl;E=direct bond, -CR=CR-, =CR-, group of formula (a), =N-, -NR-, -O-, -S-, -PR-, =P- or -P(O)R-;R=H, alkyl, alkoxy, alkylthio, aryl, heteroaryl, polyethylene dioxy, perfluoro alkyl, cyano, amino, silyl, nitro, halo, or acyl;A=group combinable with semiconductor electrode bonded to Ar1 of terminal of acceptor site, alkoxy, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, heteroaryl, dioxo cyclobutenyl, carboxy, boronic acid group, phosphoryl, sulfonic acid group, sulfonyl, hydroxy, hydroxamic acid group, alkoxy, nitro, amino, mercaptyl, silyl, siloxy, azido or cyanoacrylate;andQ=alkenyl, alkynyl, benzyl, or groups derived from heterole, heterole oxide, benzo heterole, benzo heterole oxide, dibenzo heterole, dibenzo heterole oxide, fluorene derivative, dithieno heterole, dithieno heterole oxide, thieno heterole, thieno heterole oxide, benzodi heterole, benzodi heterole oxide, acene, thiazole, oxazole, benzothiadiazole, imidazole, pyrazole, pyridine, pyrimidine, pyridazine, quinoline, or isoquinoline. SPECIFIC COMPOUNDS - 11 Boron-containing compounds are disclosed, e.g. 10-(5-(5-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(2,4,6-trimethylphenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),4,9-triene-4-carboxylic acid of formula (Ia), 2-((10-(5-(5-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(2,4,6-trimethylphenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),4,9-trien-4-yl)methylidene)propanedioic acid, (2E)-3-(10-(5-(5-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(2,4,6-trimethylphenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),4,9-trien-4-yl)-2-cyanoprop-2-enoic acid, 10-(5-(5-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(4-(trifluoromethyl)phenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),4,9-triene-4-carboxylic acid, and 10-(5-(5-(7-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-2H,3H-thieno(3,4-b)(1,4)dioxin-5-yl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(4-(trifluoromethyl)phenyl)-3,11-dithia-6-aza-7 -boratricyclo(6.3.0.02,6)undeca-2(6),4,9-triene-4-carboxylic acid.    EXAMPLE - 4-(5-(5-(7,7-bis(2,4,6-trimethylphenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),3,9-trien-10-yl)-3-hexylthiophen-2-yl)-3-hexylthiophen-2-yl)-N,N-bis(4-(heptyloxy)phenyl)aniline (119 mg) was dissolved in tetrahydrofuran (4 mL) and cooled at -78 degrees C. Pentane solution (1.55 M) of t-butyl lithium was dripped to cooled product, stirred at -78 degrees C for 1 hour, excessive quantity of dry ice was added and heated to room temperature slowly. Saturated ammonium chloride aqueous solution was added to product, organic layer was separated, and the aqueous layer was extracted 3 times using diethyl ether. The organic layer was dried using anhydrous sodium sulfate, solvent was distilled off under reduced pressure after filtration, and then purified by silica gel column chromatography, to obtain 10-(5-(5-(4-(bis(4-(heptyloxy)phenyl)amino)phenyl)-4-hexylthiophen-2-yl)-4-hexylthiophen-2-yl)-7,7-bis(2,4,6-trimethylphenyl)-3,11-dithia-6-aza-7-boratricyclo(6.3.0.02,6)undeca-2(6),4,9-triene-4-carboxylic acid (Ia) (93 mg) with yield of 75% as dark red solid.