A Photoinduced Hydrogen Evolution System Using Polymer-Supported Tin Porphyrin

Abstract

: We examined the photoinduced evolution of hydrogen using a tin meso-tetraphenylporphyrin tetrasulfonate (SnTPPS) and tin meso-tetraphenylporphyrin (SnTPP) supported in various polymer films and fabrics. The hydrophilic polymers are more effective than the hydrophobic polymer as a supporter, because water penetration is easier and also the mobilities of the porphyrin molecules as well as protons and electrons in the film. A larger amount of hydrogen evolved using the SnTPPS-adsorbed keratin film (derivation of wool) than other film systems. The results indicated that keratin is a good electron transfer material. The evolved hydrogen was 25 -160 times that in other SnTPP-supported polymer films. Moreover, the fabric systems were more effective than the polymer film systems, because of the much higher specific surface area. In the SnTPP/PET fabric system, the turnover number exceeded 400 under the highpressure mercury lamp, which was about 1600 times larger than that under the tungsten lamp.

Montmorillonite Surface as a Catalyst for the Formation of Sat Metal Tetra (P-Sulphophenyl) Porphyrins

“…The Mössbauer spectrum of the sample had an isomer shift of 0.13(1) mms -1 and quadrupole splitting of 0.62(1) mms -1 , which correspond to Sn(IV). The visible absorption spectrum of the Sn(IV) TPPS is similar to the spectrum of the complex formed in refluxed solution, [35,36] though the spectrum reported in this work has a shoulder on one of the Q bands. The visible absorption spectrum of the complex formed in the presence of the UO2 2+ ion in the exchange sites of the MMT sample, is similar to those reported for the lanthanide and actinide tetraphenylporphyrin formed in refluxed solution [37] again except for the presence of a shoulder on one of the Q bands ( Table 1).…”

Studying the dynamic behaviour of porphyrins as prototype functional molecules by scanning tunnelling microscopy close to room temperature

“…The general character of these investigations is underlined by recent STM experiments at the liquid/ solid interface. Friesen et al investigated the dynamics of reversible binding of O 2 at the metal centre of cobaltoctaethylporphyrin, 115 and Blunt et al studied the dynamics of reversible transformation of two supramolecular phases of an alkylated dehydrobenzo [12]annulene derivative 116 in solution on an HOPG surface. In temperature-and concentrationdependent STM studies, the entropic and enthalpic contributions were estimated and the authors also report significant contributions from entropy close to RT.…”

“…4 The importance of porphyrins is highlighted by their omnipresence as main functional building blocks in nature 5 examples are iron porphyrin in heme 6 or magnesium porphyrin in chlorophyll 7 -but also due to their application in sensor 8,9 and solar cell technology. [10][11][12][13][14][15] The enormous potential of porphyrins for the fabrication of tailor-made functional molecular architectures on well-defined substrates has stimulated significant activities in fundamental research. 4,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] In this contribution, we review recent advances in the understanding of the dynamic behaviour of porphyrins, as representatives of organic molecules, adsorbed on a Cu(111) single crystal surface in ultra-high vacuum (UHV).…”