Synthesis and photochromic properties of tricarbonylchromium complexes of 2H‐η6‐benzochromenes

Hannesschlager, Patrick; Brun, P.

doi:10.1002/1099-0739(200007)14:7<371::aid-aoc11>3.3.co;2-a

Cited by 2 publications

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“…Ru−porphyrinato attached via a pyridyl spacer,3b Ru−tris-Bpy attached via an ethynyl spacer, Cu attached via a nitrile spacer, or azacrown-complexed species attached through a benzyl spacer, are known. Indeed, even for other photochromic cores, organometallic derivatives are rare . Potentially however, such metal-modified switches are rather interesting, since the metal could not only modify the switching characteristics, but introduce interesting electrochemical behavior as well.…”

Section: Introductionmentioning

confidence: 99%

A Photochromic, Electrochromic, Thermochromic Ru Complexed Benzannulene: an Organometallic Example of the Dimethyldihydropyrene−Metacyclophanediene Valence Isomerization

et al. 2003

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The preparation of the first photochromic, organometallic derivative of the diarylethene class, the CpRu-complexed benzodimethyldihydropyrene 3, in which the organometallic is directly attached to the photochromic core, is described. The negative dark purple photochrome 3 readily bleaches to form the almost colorless cyclophanediene 3' on irradiation with visible light. The latter switches back to 3 either photochromically with UV light, electrochromically on reduction, or thermochromically on heating. Essentially quantitative conversion between the two states is possible. The open complex 3' thermally closes 2.6 times faster than the uncomplexed parent 2', but the closed form 3 opens with visible light at about 30% of the rate of uncomplexed 2. Both open forms, complexed 3' and uncomplexed 2' close equally fast with UV light.

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Section: Introductionmentioning

confidence: 99%

A Photochromic, Electrochromic, Thermochromic Ru Complexed Benzannulene: an Organometallic Example of the Dimethyldihydropyrene−Metacyclophanediene Valence Isomerization

et al. 2003

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“…In previous studies we have shown that the complexation of these compounds with a chromium tricarbonyl moiety on the A, B or B' aromatic ring stabilizes the open forms and thus reduces the thermal bleaching kinetic constant (Eqn [1]). 2,3 In this work we present regioselective syntheses of the same type of substrates in which the chromium tricarbonyl group is located on the C or D rings ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Regioselective complexation in the 2H-chromene series and studies of their photochromic properties

Hannesschlager

Brun

2000

Appl. Organometal. Chem.

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The regioselectivity of the complexation of chromenes with tricarbonyl(trispyridine)chromium [Cr(CO) 3 Py 3 ] can be controlled by the addition of BF 3 ÁEt 2 O boron trifluoride etherate. Depending on the molar ratio of the Lewis acid, different complexes can be prepared. The spectrokinetic properties of the so-formed complexes were studied and it was shown that the thermal bleaching constants are either more or less reduced, depending on the position of the chromium tricarbonyl moiety.

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Synthesis and photochromic properties of tricarbonylchromium complexes of 2H‐η6‐benzochromenes

Cited by 2 publications

References 0 publications

A Photochromic, Electrochromic, Thermochromic Ru Complexed Benzannulene: an Organometallic Example of the Dimethyldihydropyrene−Metacyclophanediene Valence Isomerization

A Photochromic, Electrochromic, Thermochromic Ru Complexed Benzannulene: an Organometallic Example of the Dimethyldihydropyrene−Metacyclophanediene Valence Isomerization

Regioselective complexation in the 2H-chromene series and studies of their photochromic properties

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