Light‐Induced Transformation of Molecular Materials into Devices

Abstract

closely related aliphatic amines by color change is unusual, and to the best of our knowledge only a very recent example has been reported using molecularly imprinted polymers.[4a]The ideas reported here open the possibility of developing a new generation of tailor-made selective sensing systems built by fine control of the properties of both the molecular receptor and the solid. In particular, the anchoring of molecular reporters onto suitable siliceous mesoporous supports can be a promising tuning tool for selectivity enhancement which might, in principle, be applied to the design of new chemosensors for a broad range of target species. Rev. 2003, 204, 191. [3] Some very recent chromoreactands for amines have been described, for instance, based on (trifluoroacetyl)azobenzene dyes and pyrylium cyanine dyes. a) G.

Photochemical modification of magnetic properties in organic low-dimensional conductors

“…The borderline of irradiated and nonirradiated parts was clear and sharp, judging from the contrasting spectra obtained from both sides of the borderline. Accordingly, the spatial resolution of such photochemical modification was as high as those observed for a related salt [15]. In order to check how deeply the irradiation effects could reach, the other side of the same sample (a pellet irradiated only at the center) was also examined by XPS at every half a day, and an identical result was obtained on the sample irradiated for four days: only the other side of irradiated part showed the abovementioned shifts of the peaks, while the other side of nonirradiated part showed no change in the XPS compared with those of the pristine sample.…”

“…A solution to these difficult problems was proposed in 2004; a photochemical method to control the number of carriers (unpaired electrons) with spatial resolution [15][16][17][18][19][20][21]. Utilizing this method a single crystal of Ag(DM) 2 (DM = 2,5-dimethyl-N,N'-dicyanoquinonediimine) can be irreversibly transformed to a diode, which have a junction interface between the irradiated and the non-irradiated parts in the crystal.…”

Molecular-based light-activated thyristor

“…22 ␣-͑BEDT-TTF͒ 2 I 3 has an arrangement of a donor layer classified as ␣ type and has a layered structure composed of a conducting BEDT-TTF layer and an insulating I 3 − layer. In the unit cell, there are four BEDT-TTF molecules and two I 3 − molecules, and consequently this crysa͒ Author to whom correspondence should be addressed; electronic mail: nohta@es.hokudai.ac.jp tal has 3 / 4-filled band.…”

“…24,25 A single crystal of ␣-͑BEDT-TTF͒ 2 I 3 was prepared by an electrocrystallization method. 23 The dimension of typical samples was 1 ϫ 0.5ϫ 0.05 mm 3 . The measurement method used in this work is essentially the same as that reported elsewhere.…”

“…[1][2][3][4] Organic chargetransfer ͑CT͒ complexes have, in particular, received intense attention as prospective materials 5 since high electrical conductivity in the CT compound between perylene and bromide was discovered by Akamatu et al in 1954. 6 So far a great number of organic CT complexes have been developed and are known to show not only the electrical conductivity but also versatile, intriguing, and technically useful properties such as superconductivity, 7,8 magnetism, 9-11 ferromagnetism, 12 optical nonlinearity, 13 and ion conductivity.…”