118-12-7Relevant articles and documents
A NEW METHOD OF SYNTHESIS OF CONJUGATED SYSTEMS WITH TRIS(FLUOROMETHINE) CHAIN
Pazenok, S. V.,Kovtyukh, I. P.,Yagupolskii, L. M.
, p. 4595 - 4598 (1991)
The interaction of compounds having the active methylene group with perflouroallyliodide leads to the formation of conjugated systems with the tris(fluoromethine) chain.
Crystal and solution structures of photochromic spirobenzothiopyran. First full characterization of the meta-stable colored species
Hirano, Masafumi,Osakada, Kohtaro,Nohira, Hiroyuki,Miyashita, Akira
, p. 533 - 540 (2002)
Full elucidation for stable, colorless, and meta-stable colored structures of a new spirobenzothiopyran has been achieved both in the solid state and in a solution. 1′,3′,3′-Trimethyl-6-nitrospiro[(2H)-1-benzothiopyran-2, 2′-indoline] with an ester group as a substituent at the 8-position of 1-sp shows photochromism. The blue-green colored species resulted from UV irradiation (365 nm) in one minute and spontaneously bleaches within one minute in acetone and methanol at 27 °C. UV exposure (365 nm) of 1-sp in methanol for 3 h at room temperature results in the growth of deep blue needlelike single crystals of the open form of spirobenzothiopyran, photomerocyanine 1-pmc, whose structures in the solid state and in solution were obtained unambiguously. The X-ray structural analysis of 1-pmc revealed the molecular structure of the zwitterionic photomerocyanine with s-trans,s-trans conformation. 1-pmc is soluble to polar solvents and thermally returns to 1-sp. In the DMSO solution, 1-pmc is found to return slowly to 1-sp (1-pmc gave only 18% of 1-sp for 30 min at 22 °C). The detailed NMR studies in DMSO-d6 including COSY and NOE techniques as well as isotope labeling of the compound showed the structure with s-trans,s-cis conformation in a solution.
Structures of Lithium Salts of 2,3,3-Trimethylindolenine and Its 5-Methoxy Derivative in Solution and the Solid State
Jackman, L. M.,Scarmoutzos, L. M.,Smith, B. D.,Williard, Paul G.
, p. 6058 - 6063 (1988)
An X-ray crystal structure of lithium 2,3,3-trimethylindolenide etherate shows it to be a disolvated dimer having a η3-azaallyl-type structure.The structures of the salt in several solvents have been established by studies of 13C chemical shifts, 6Li, 15N spin-spin splitting, 7Li quadrupole splitting constants, and apparent degrees of aggregation determined by vapor pressure barometry.It is the η3-azaallyl dimer disolvate in diethyl ether, a tetrasolvated dimer in dioxolane, a mixture of monomer splitting constants of 230, 156, 180 - 190 (0.27 - 0.75 M), and 217 kHz, respectively.In diethyl ether with 4 equiv of hexamethylphosphoric triamide, the salt is a mixture of monomeric and triple ion species.Lithium 5-methoxy-2,3,3-trimethylindolenide forms similar species except that, in tetrahydrofuran, the tendency for dimer formation is enhanced, which leads to a higher proportion of C- to N-methylation in its reaction with methyl chloride in that solvent.
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Bernauer et al.
, p. 717,723 (1960)
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NOVEL SQUARYLIUM COMPOUNDS, AND COMPOSITIONS COMPRISING SAME
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, (2021/04/29)
The present disclosure is disclosed herein. The present invention relates to a novel squarylium compound and a near infrared absorbing resin composition containing the squarylium compound.
Novel Spiropyran Based Composition and Application Thereof as Security Tag
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, (2018/06/30)
The present invention discloses the spiropyran compound of formula (I), process for preparation thereof and a composition comprising spiropyran compound of formula (I) on a support, wherein said support selected from polymers such as Poly (ethylene oxide), Polydimethylsiloxane (PDMS), Ethylene propylene diene monomer (EPDM).