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Contents list for Photochemical & Photobiological Sciences, issue 2, 2010
Front cover
Photochem. Photobiol. Sci., 2010, 9, 117
DOI: 10.1039/c001345p
Contents
Photochem. Photobiol. Sci., 2010, 9, 119
DOI: 10.1039/c001346n
Editorial
Synthetic and natural photoswitches
Photochem. Photobiol. Sci., 2010, 9, 127
DOI: 10.1039/b925378p
A touch of colour! Photochromic materials continue to generate great interest for the preparation of new photoresponsive systems bridging the molecular and macroscopic domains.
Communication
Photochromic dithienylethenes with extended 
-systems
Oliver Tosic, Kai Altenhöner and Jochen Mattay,
Photochem. Photobiol. Sci., 2010, 9, 128
DOI: 10.1039/b9pp00100j
We describe a series of six new dithienylethenes and their photochromic behaviour. It is shown that upon elongation of the conjugated system the absorption maxima of these compounds can be shifted even to the visible region.
Papers
Photochromic performance of a dithienylethene–indolinooxazolidine hybrid
Guillaume Sevez, Jiaan Gan, Stéphanie Delbaere, Gaston Vermeersch, Lionel Sanguinet, Eric Levillain and Jean-Luc Pozzo,
Photochem. Photobiol. Sci., 2010, 9, 131
DOI: 10.1039/b9pp00127a
A covalently-linked dithienylperfluorocyclopentene and indolino[2,1-b]oxazolidine hybrid molecule shows biphotochromic performance. A phototriggered switch with 22 states is obtained and each state can be selectively addressed by choosing appropriate wavelengths of light.
Hydrophilic and photochromic switches based on the opening and closing of [1,3]oxazine rings
Massimiliano Tomasulo, Erhan Deniz, Salvatore Sortino and Françisco M. Raymo,
Photochem. Photobiol. Sci., 2010, 9, 136
DOI: 10.1039/b9pp00114j
Photochromic oxazines with hydrophilic substituents can be interconverted reversibly between two states in microseconds for hundreds of switching cycles in aqueous environments under the influence of optical stimulations.
Transient Brewster angle reflectometry of spiropyran monolayers
Sergey Gorelik, Song Hongyan, Martin J. Lear and Jonathan Hobley,
Photochem. Photobiol. Sci., 2010, 9, 141
DOI: 10.1039/b9pp00105k
A method in laser flash-photolysis that based upon reflectometry at Brewster's angle is presented that allows photo-transformations to be monitored in molecular monolayers and thin films containing photoactive molecules such as spiropyran.
Formation of photoresponsive gold nanoparticle networks via click chemistry
Atsushi Kimoto, Koji Iwasaki and Jiro Abe,
Photochem. Photobiol. Sci., 2010, 9, 152
DOI: 10.1039/b9pp00108e
We investigated the formation of a novel class of photoresponsive gold nanoparticle networks possessing an azobenzene spacer by using click reactions of azide-functionalized GNPs and dialkyne-terminated functional molecules.
Efficient carrier separation from a photochromic diarylethene layer
Tsuyoshi Tsujioka, Muneyuki Yamamoto, Kentaro Shoji and Keita Tani,
Photochem. Photobiol. Sci., 2010, 9, 157
DOI: 10.1039/b9pp00083f
Efficient carrier separation from a device with a heterojunction between an n-type photochromic diarylethene layer and a p-type layer of N,N
-di(1-naphthyl)-N,N-diphenylbenzidine resulted in a photocurrent even at a zero applied voltage.
Fast decoloration of spironaphthooxazine bound to a poly(dimethylsiloxane) network
Tsuyoshi Gushiken, Masako Saito, Takashi Ubukata and Yasushi Yokoyama,
Photochem. Photobiol. Sci., 2010, 9, 162
DOI: 10.1039/b9pp00113a
Unprecedentedly fast decoloration of spironaphthooxazine in a polymer matrix has been achieved in a polysiloxane network.
Multiphoton-gated cycloreversion reactions of photochromic diarylethene derivatives with low reaction yields upon one-photon visible excitation
Yukihide Ishibashi, Katsuki Okuno, Chikashi Ota, Toshiyuki Umesato, Tetsuro Katayama, Masataka Murakami, Seiya Kobatake, Masahiro Irie and Hiroshi Miyasaka,
Photochem. Photobiol. Sci., 2010, 9, 172
DOI: 10.1039/b9pp00116f
A stepwise two-photon absorption process led to the drastic enhancement (
2500-fold) of the cycloreversion reaction for diarylethene derivatives with an extremely low reaction yield.
Fluorescence photoswitching of a diarylethene–perylenebisimide dyad based on intramolecular electron transfer
Tuyoshi Fukaminato, Masaaki Tanaka, Takao Doi, Nobuyuki Tamaoki, Tetsuro Katayama, Arabinda Mallick, Yukihide Ishibashi, Hiroshi Miyasaka and Masahiro Irie,
Photochem. Photobiol. Sci., 2010, 9, 181
DOI: 10.1039/b9pp00131j
A fluorescence diarylethene derivative, which changes fluorescence quantum yield based on the photocontrol of intramolecular electron transfer, was synthesized. The fluorescence quenching mechanism was investigated with spectroscopic measurements.
Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene
Arnaud Spangenberg, Jose Alejandro Piedras Perez, Abhijit Patra, Jonathan Piard, Arnaud Brosseau, Rémi Métivier and Keitaro Nakatani,
Photochem. Photobiol. Sci., 2010, 9, 188
DOI: 10.1039/b9pp00133f
UV-visible and IR spectroscopy are combined to quantify the composition of photochromic isomers and the quantum yields.
The DC gate in Channelrhodopsin-2: crucial hydrogen bonding interaction between C128 and D156
Melanie Nack, Ionela Radu, Michael Gossing, Christian Bamann, Ernst Bamberg, Gabriele Fischer von Mollard and Joachim Heberle,
Photochem. Photobiol. Sci., 2010, 9, 194
DOI: 10.1039/b9pp00157c
FT-IR difference spectroscopy elucidates the 
DC gate
as the molecular switch in the opening and closing process of the light-gated ion channel Channelrhodopsin-2 by using point mutants D156E and C128T.
Quantitative investigations of cation complexation of photochromic 8-benzothiazole-substituted benzopyran: towards metal-ion sensors
Marianna I. Zakharova, Christophe Coudret, Véronique Pimienta, Jean Claude Micheau, Stéphanie Delbaere, Gaston Vermeersch, Anatoly V. Metelitsa, Nikolai Voloshin and Vladimir I. Minkin,
Photochem. Photobiol. Sci., 2010, 9, 199
DOI: 10.1039/b9pp00112c
Kinetic monitoring of the Co(II) complexation of the spiropyran-merocyanine equilibrium system allows the determination of the association constants and spectra of monomeric and dimeric complexes. Free merocyanine form B is the key kinetic intermediate.
Photo-controlled phase separation and mixing of a mixture of water and 2-butoxyethanol caused by photochromic isomerisation of spiropyran
Shinji Kajimoto, Ayaka Mori and Hiroshi Fukumura,
Photochem. Photobiol. Sci., 2010, 9, 208
DOI: 10.1039/b9pp00137a
Phase separation of a simple binary solution was controlled with photochromic isomerization of solute spiropyran. UV light irradiation made the solution transparent dark red whereas visible light turned it milky white.
Spiropyrans as molecular optical switches
Britta Seefeldt, Robert Kasper, Mirco Beining, Jochen Mattay, Jutta Arden-Jacob, Norbert Kemnitzer, Karl Heinz Drexhage, Mike Heilemann and Markus Sauer,
Photochem. Photobiol. Sci., 2010, 9, 213
DOI: 10.1039/b9pp00118b
We demonstrate that spiropyrans can be used as efficient photoswitches and, in combination with suitable donor fluorophores, can operate as efficient photoswitchable energy transfer acceptors at the ensemble as well as at the single-molecule level.
Photoinduced shape changes of diarylethene single crystals: correlation between shape changes and molecular packing
Lumi Kuroki, Shizuka Takami, Kenji Yoza, Masakazu Morimoto and Masahiro Irie,
Photochem. Photobiol. Sci., 2010, 9, 221
DOI: 10.1039/b9pp00093c
Single crystals of three different diarylethene derivatives ( 1a, 3a and 4a) having different chemical structures, showed similar photoinduced shape changes from square to lozenge. The deformation mode is determined by the packing mode of component molecules in the crystal.
Functional interaction structures of the photochromic retinal protein rhodopsin
Kristina Kirchberg, Tai-Yang Kim, Sebastian Haase and Ulrike Alexiev,
Photochem. Photobiol. Sci., 2010, 9, 226
DOI: 10.1039/b9pp00134d
Interaction structures of the retinal protein rhodopsin were studied using time-resolved fluorescence depolarization measurements and single-molecule widefield microscopy. Retinal isomerization from 11-cis to all-trans provokes protein surface dynamic changes that are specific for active metarhodopsin-II, but absent in phosphorhodopsin and opsin.
Facile synthesis and characterization of new photochromic trans-dithienylethenes functionalized with pyridines and fluorenes
Qianfu Luo, Yi Liu, Xin Li and He Tian,
Photochem. Photobiol. Sci., 2010, 9, 234
DOI: 10.1039/b9pp00088g
Three symmetrical and unsymmetrical trans-dithienylethenes functionalized with pyridines and fluorenes have been synthesized by a facile one-pot procedure, and their characteristics and photochromism were investigated.
Higher resolution in localization microscopy by slower switching of a photochromic protein
Hideaki Mizuno, Peter Dedecker, Ryoko Ando, Takashi Fukano, Johan Hofkens and Atsushi Miyawaki,
Photochem. Photobiol. Sci., 2010, 9, 239
DOI: 10.1039/b9pp00124g
Slow switching of a photochromic protein to the non-fluorescent state increased the number of photons detected from respective molecules, which contributed to improve the resolution of the image acquired by photoactivated localization microscopy (PALM).
Optical control of quantum dot luminescence via photoisomerization of a surface-coordinated, cationic dithienylethene
Zach Erno, Ibrahim Yildiz, Brian Gorodetsky, Françisco M. Raymo and Neil R. Branda,
Photochem. Photobiol. Sci., 2010, 9, 249
DOI: 10.1039/b9pp00115h
Photoisomerization of a coordinating, photochromic dithienylethene bearing a pyridine and a methylpyridinium group reversibly modulates the luminescence from CdSe–ZnS core–shell quantum dots.
Low-temperature switching by photoinduced protonation in photochromic fluorescent proteins
Aline Regis Faro, Virgile Adam, Philippe Carpentier, Claudine Darnault, Dominique Bourgeois and Eve de Rosny,
Photochem. Photobiol. Sci., 2010, 9, 254
DOI: 10.1039/b9pp00121b
Low-temperature reversible photoswitching between anionic and neutral chromophore states was demonstrated in a number of photochromic fluorescent proteins.
Back cover
Photochem. Photobiol. Sci., 2010, 9, 263
DOI: 10.1039/c001347c
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