Synthesis of new lanthanide naphthalocyanine complexes based on 6,7-bis(phenoxy)-2,3-naphthalodinitrile and their spectral and electrochemical investigation

A number of naphthalocyanine and dinaphthalocyanine complexes of the rare-earth elements based on 6,7-bis(phenoxy)-2,3-naphthalodinitrile obtained for the first time has been synthesized and their spectral properties have been investigated. Electrochemical behavior of lutetium [bis(octaphenoxy)naphthalocyanine] in the thin hydrophobic films has been studied. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1879–1885, September, 2008.     

Photodynamic therapy of cancer: Second and third generations of photosensitizers

Photodynamic therapy of cancer (PDT) at early stages of various types of cancer is based on the use of the phototoxicity of photosensitizers (PS) which appears upon their excitation by light in tumor tissues. The review concentrates mainly on the data for the second and third generations of photosensitizers: the structure of PS, their photophysical and photochemical properties, and some results of theirin vitro andin vivo application. A carefully designed PS should exhibit the following properties: long-wave absorption, good singlet oxygen quantum yield, an intramolecular polarity axis, and lowin vivo (photooxidation) stability. Uncharged PS that are lipophilic, positively charged, and capable of binding with monoclonal antibodies are discussed as an example.     

Tetrabrominated Lead Naphthalocyanine for Optical Power Limiting

The complex 2,(3)‐tetrabromo‐3,(2)‐tetra[(3,5‐di‐tert‐butyl)phenyloxy]‐naphthalocyaninato lead [Br₄(tBu₂C₆H₃O)₄NcPb, 1 ] has been prepared and its optical limiting properties for ns light pulses have been measured. Complex 1 behaves as a reverse saturable absorber within the spectral range 440–720 nm with a limiting threshold of 0.1 J cm^?2 at 532 nm. The lifetime of the absorbing triplet excited state has been evaluated as 3.8×10^?7 s and the quantum yield of triplet formation has been measured as 0.07 in toluene. The nonlinear optical transmission properties of complex 1 have also been determined in Plexiglas [naphthalocyanine content: 5.0×10^?4 M (0.1 % by weight)]. A reversible nonlinear absorption was again observed for a fluence above 0.4 J cm^?2, but through different excited‐state dynamics. This may be rationalized in terms of aggregation of the molecule in the polymer matrix.     

温度对稀土夹心双萘酞菁LB膜光学性质的影响

 采用线性吸收谱和二次谐波产生技术研究了温度对具有中心对称结构的稀土夹心双萘酞菁化合物LB膜光学特性及其LB膜结构的影响。研究发现,加热可以使其LB膜的结构及分子间的相互作用发生变化,并形成J聚集体,从而使得吸收峰发生红移。稀土夹心双萘酞菁化合物约在40 ℃时其二次谐波信号有一个极小值,约在65 ℃时该化合物发生相变,使得二次谐波信号产生极大值,二次谐波信号最小时温度可高达180 ℃,说明该化合物的化学结构较为稳定。