Reversible thermal gating of the photochromic properties of 3-methyl-2-(2′,4′-dinitrobenzyl)pyridine in a single crystal

Crystal Growth and Design

Volumn 5, Issue 5, 2005, Pages 1699-1701

  Naumov, Panče ^a   Sakurai, Kenji ^a  

^a NATIONAL INSTITUTE FOR MATERIALS SCIENCE   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 25444488275     PISSN: 15287483     EISSN: None     Source Type: Journal    
DOI: 10.1021/cg050328+     Document Type: Article

References (16)

1. Bernstein, J. Polymorphism in Molecular Crystals; Oxford University Press: New York, 2002; pp 213-223.
2. Naumov, P.; Ohashi, Y. Acta Crystallogr. 2004, B60, 343.
3. Eichen, Y.; Botoshansky, M.; Peskin, U.; Scherl, M.; Haarer, D.; Khatib, S. J. Am. Chem. Soc. 1997, 119, 7167.
4. Schmidt, A.; Kababya, S.; Appel, M.; Khatib, S.; Botoshansky, M.; Eichen, Y. J. Am. Chem. Soc. 1999, 121, 11291.
5. Khatib, S.; Tal, S.; Godsi, O.; Peskin, U.; Eichen, Y. Tetrahedron 2000, 56, 6753.
6. Naumov, P.; Sekine, A.; Uekusa, H.; Ohashi, Y. J. Am. Chem. Soc. 2002, 124, 8540.
7. Irie, M. Chem Rev. 2000, 100, 1685.
8. At cryogenic temperatures, the largest amount of the product (NH) is created by proton tunneling (Scherl, M.; Haarer, D.; Fischer, J.; DeCian, A.; Lehn, J.-M.; Eichen, Y. J. Phys. Chem. 1996, 100, 16175)
9. and/or open-shell reactions (Naumov, P.; Ohashi, Y. J. Phys. Org. Chem. 2004, 17, 865).
10. The temperature was corrected for differences between the monitored and real temperature at the crystal position. Temperature variations during the data collection were typically 0.6 K and did not exceed 1.5 K.
11. 2 in hexane).
12. Good quality colorless crystals of forms A and C, which can be visually discerned by the crystal shape and by their photoactivity, were obtained concomitantly by slow evaporation of ethanol solutions or by seeding at room temperature in the dark. Data for form A were collected (Mo Kα) from a 360 x 240 x 200 μm crystal protected from light with Siemens SMART diffractometer (SAINT-Siemens Area Detector Integration and SMART-Siemens Molecular Analysis Research Tool; Siemens Analytical X-ray Instruments Inc.: Madison, WI, USA, 1996) equipped with CCD detector and open-flow low-temperature system with cold nitrogen gas.
13. For each dataset, the crystal was kept for about 4 h at constant temperature. The structures were solved with direct methods (Altomare, A.; Cascarano, G.; Giacovazzo, C.; Guagliardi, A.; Burla, M. C.; Polidori, G.; Camalli, M. J. Appl. Crystallogr. 1994, 27, 435)
14. and refined (Sheldrick, G. M. E. SHELXL-97, Structure refinement program; University of Göttingen, Germany, 1997) with all non-H atoms anisotropic and the H atoms as riding bodies to the respective non-H atoms.
15. Calculated from the change of a axis.
16. max = 365 nm, SP-7, 250 W, Ushio) at 320 K placed 1-2 cm from the crystal, using internal heat filter, whereupon it turned deep blue-violet. Irradiation for less than 1 s or with smaller power did not result in observable changes of the diffraction pattern.