Porphyrin polyimide

Figure 30. Structure of Peng s zinc porphyrin polyimide system with pendant organic NLO chromophore.

X 10 mol L range, with a detection limit of 0.27 jM. The fluorescence energy transfer between ferrocene donor and porphyrin acceptor was also considered. Nanofibers with distinct luminescent property were fabricated by electrospinning porphyrinated polyimides. The new material demonstrated to be a very interesting sensory material for detection of trace amounts of TNT vapor (10 ppb) [249]. The presence of covalently bonded porphyrin fluorophores in the main chain diminish the aggregation-induced self-quenching of fluorescence and improves the physicochemical stability of the polyimide nanofibers. 

IK also claimed polymeric emitting materials comprising a polyimide, polyamideimide, polyurea, or polyazomethine with a dye component such as phthalocyanine, porphyrin, triphenylamine, oxadiazole moieties or polycarbonate with a diarylvinylene arylene skeleton or styrylamine core. 

The polyimide-base PR system [79,80] was designed on the premise that porphyrin-electron acceptor (quinones or imide moieties) systems are well-known model compounds for photosynthetic processes and exhibit very interesting charge transfer properties [81], A high quantum yield of charge separation can be achieved in these systems. Polyimides are found to be photoconductive and allow charge transport [82], Furthermore, polyimides possess high Tg and therefore, the electric field-induced dipole orientation can be fixed after imidization [83],... 

Abbreviations AD, asymmetric dihydroxylation BPY, 2,2 -bipyridine DMTACN, 1,4-dimethyl-l,4,7-triazacyclonane EBHP, ethylbenzene hydroperoxide ee, enantiomeric excess HAP, hydroxyapatite LDH, layered double hydroxide or hydrotalcite-type structure mCPBA, meta-chloroperbenzoic acid MTO, methyltrioxorhenium NMO, A-methylmorpholine-A-oxide OMS, octahedral molecular sieve Pc, phthalocyanine phen, 1,10-phenantroline PILC, pillared clay PBI, polybenzimidazole PI, polyimide Por, porphyrin PPNO, 4-phenylpyridine-A-oxide PS, polystyrene PVP, polyvinylpyridine SLPC, supported liquid-phase catalysis f-BuOOH, tertiary butylhydroperoxide TEMPO, 2,2,6,6-tetramethyl-l-piperdinyloxy TEOS, tetraethoxysilane TS-1, titanium silicalite 1 XPS, X-ray photoelectron spectroscopy. 

Another new photorefractive polyimide (Figure 30) with a main-chain zinc porphyrin (/ = 0.005) and a NLO-chromophore side chain (n = 0.995) was reported by Peng et This porphyrin-containing fluorinated polyimide displayed a Tg of 228 °C and maintained thermal stability to... 

Okita, H., T. Ogi, R. Kinoshita, S. Ito, and M. Yamamoto (2002). Photoinduced electron transfer in nanostructures of ultrathin polyimide films containing porphyrin moieties. Polymer 43(12), 3571-3577. 

One photorefractive polyimide 59 was formed by linking thee units, a substituted porphyrin (charge generator), 4-amino-4 -nitrostilbene derivative (the nonlinear optics molecule), and a charge transporting agent, pyromellitic dianhydride. This polyimide retains its nonlinear optical properties even after... 

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