Exciton coupling and charge resonance in the lowest excited states of lutetium phthalocyanine dimer and trimer

✍ Scribed by Naoto Ishikawa; Youkoh Kaizu

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 436 KB
• Volume: 228
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)00982-1

✦ Synopsis

The measurement of the electronic spectrum of triple-decker phthalocyanine trimer in solution showing the existence of lowlying excited states in the near-IR region is reported. The spectroscopic measurement in solution was made possible by using a newly synthesized trimer ( [ (Pc)Lu (CRPc)Lu(Pc) ]: Pc = phthalocyanine; CRPc= 15-crown-5 substituted Pc) having high solubility and purifiability. The lowest excited states caused by intra-and inter-macrocyclic HOMO-LUMO transitions are studied in terms of exciton coupling and charge resonance. The inherent differences between the trimer and dimer are elucidated. The assignment of absorption bands below 20 × 103 cm-1 is discussed.