Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini.

Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Research Abstract Details 

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Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Abstract Text:

H M Anula,Jeffrey C Berlin,Hongqiao Wu,Ying-Syi Li,Xingzhan Peng,Malcolm E Kenney,Michael A J Rodgers,

Eleven silicon phthalocyanines which can be grouped into two homologous series [SiPc[OSi(CH3)2(CH2)(n)N(CH3)2]2, n = 1-6 (series 1), and SiPc[OSi(CH3)2(CH2)3N((CH2)(n)H)2]2, n = 1-6 (series 2)] as well as an analogous phthalocyanine, SiPc[OSi(CH3)2(CH2)3NH2]2, were synthesized. The ground state absorption spectra, the triplet state dynamics, and singlet oxygen quantum yields of 10 of these phthalocyanines were measured. All compounds displayed similar ground state absorption spectral properties in dimethylformamide solution with single Q band maxima at 668 +/- 2 nm and B band maxima at 352 +/- 1 nm. Photoexcitation of all compounds in the B bands generated the optical absorptions of the triplet states which decayed with lifetimes in the hundreds of microseconds region. Oxygen quenching bimolecular rate constants near 2 x 10(9) M(-1) s(-1) were measured, indicating that energy transfer to oxygen was exergonic. Singlet oxygen quantum yields, phi(delta), were measured, and those phthalocyanines in which the axial ligands are terminated by dimethylamine residues at the end of alkyl chains having four or more methylene links exhibited yields near > or = 0.35. Others gave singlet oxygen quantum yields near 0.2, and still others showed singlet oxygen yields of <0.1. The reduced singlet oxygen yields are probably caused by a charge transfer quenching of the 1pi,pi* state of the phthalocyanine by interaction with the lone pair electrons on the nitrogen atoms of the amine termini. In some cases, these can approach and interact with the electronically excited pi-framework, owing to diffusive motions of the flexible oligo-methylene tether.

Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Publishing Authors By Initials

HM Anula,JC Berlin,H Wu,YS Li,X Peng,ME Kenney,MA Rodgers,

For similar inorganic chemicals: silicon compounds: siloxanes research abstracts see: inorganic chemicals: silicon compounds: siloxanes research

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Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The journal of physical chemistry. A

VOLUME: 110

Page Numbers: 5215-23

Journal Abbreviation:

ISSN: 1089-5639

DAY: 20

MONTH: Apr

YEAR: 2006

Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Information

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LANGUAGE: eng

NlmUniqueID: 9890903

Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Keywords Mesh Terms:

KEYWORDS: Siloxanes

MESH TERMS: chemistry

Chemical & Substance for Abstract: Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini. Information

Substance Name: silicon phthalocyanine

Registry Number: 135719-28-7

Grant and Affiliation Information for Synthesis and photophysical properties of silicon phthalocyanines with axial siloxy ligands bearing alkylamine termini.

AFFILIATION: Center for Photochemical Sciences and Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403, USA.

Country: United States

AGENCY: United States NCI

GRANT: CA 91027

ACRONYM: CA

MEDLINETA: J Phys Chem A

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