| Autor: |
Kisel KS; Institute of Chemistry, Saint-Petersburg State University, Universitetskii pr., 26, 198504 St. Petersburg, Russia., Baigildin VA; Institute of Chemistry, Saint-Petersburg State University, Universitetskii pr., 26, 198504 St. Petersburg, Russia., Solomatina AI; Institute of Chemistry, Saint-Petersburg State University, Universitetskii pr., 26, 198504 St. Petersburg, Russia., Gostev AI; Department of Physical Chemistry, Saint-Petersburg State Institute of Technology, Technical University, Moskovskiy pr. 26, 190013 St. Petersburg, Russia., Sivtsov EV; Department of Physical Chemistry, Saint-Petersburg State Institute of Technology, Technical University, Moskovskiy pr. 26, 190013 St. Petersburg, Russia., Shakirova JR; Institute of Chemistry, Saint-Petersburg State University, Universitetskii pr., 26, 198504 St. Petersburg, Russia., Tunik SP; Institute of Chemistry, Saint-Petersburg State University, Universitetskii pr., 26, 198504 St. Petersburg, Russia. |
| Abstrakt: |
A series of diphosphine Re(I) complexes Re1 - Re4 have been designed via decoration of the archetypal core {Re(CO) 2 (N^N)} through the installations of the phosphines P 0 and P 1 bearing the terminal double bond, where N^N = 2,2'-bipyridine ( N^N1 ), 4,4'-di-tert-butyl-2,2'-bipyridine ( N^N2 ) or 2,9-dimethyl-1,10-phenanthroline ( N^N3 ) and P 0 = diphenylvinylphosphine, and P 1 = 4-(diphenylphosphino)styrene. These complexes were copolymerized with the corresponding N-vinylpyrrolidone-based Macro-RAFT agents of different polymer chain lengths to give water-soluble copolymers of low-molecular p(VP-l-Re ) and high-molecular p(VP-h-Re) block-copolymers containing rhenium complexes. Compounds Re1 - Re4 , as well as the copolymers p(VP-l-Re) and p(VP-h-Re) , demonstrate phosphorescence from a 3 MLCT excited state typical for this type of chromophores. The copolymers p(VP-l-Re#) and p(VP-h-Re#) display weak sensitivity to molecular oxygen in aqueous and buffered media, which becomes almost negligible in the model physiological media. In cell experiments with CHO-K1 cell line, p(VP-l-Re2) and p(VP-h-Re2) displayed significantly reduced toxicity compared to the initial Re2 complex and internalized into cells presumably by endocytic pathways, being eventually accumulated in endosomes. The sensitivity of the copolymers to oxygen examined in CHO-K1 cells via phosphorescence lifetime imaging microscopy (PLIM) proved to be inessential. |
