Crystal and molecular structure of some thermochromic Schiff bases

Moustakali‐Mavridis, I.; Hadjoudis, E.; Mavridis, Aristides

doi:10.1107/s0567740878011930

Cited by 173 publications

(78 citation statements)

References 3 publications

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“…The C-C aromatic bonds in the salicylidene ring range from 1.37 (1) to 1.41 (1)A (Table 2). The smallest values correspond to the usual short C(3)-C(4), C(5)-C(6) bonds encountered in N-salicylidene-2-aminopyridine (Moustakali- Mavridis, Hadjoudis & Mavridis, 1978) and in N-salicylidene-3-aminopyridine (Moustakali- Mavridis, Hadjoudis & Mavridis, 1980). The short C-O bond of 1.34 (I)/~ is normal in this type of compound.…”

Section: By C Escobar and M T Garlandmentioning

confidence: 87%

Structure of 2-(4,6-dimethyl-2-pyridyliminomethyl)phenol, C14H14N2O

Escobar¹,

Garland²

1984

Acta Crystallogr C

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Section: By C Escobar and M T Garlandmentioning

confidence: 87%

Structure of 2-(4,6-dimethyl-2-pyridyliminomethyl)phenol, C14H14N2O

Escobar¹,

Garland²

1984

Acta Crystallogr C

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“…Also, it is known that Schiff bases may exhibit thermochromism, depending on the planarity or non-planarity, respectively. 7 The C11-O2 and N1-C14 bond lengths show that the keto-amine forms the title compound (Table 2). These values are in good agreement with the 2-hydroxy-6-[(1-napthylamino)methylene]-cyclohexa-2,4-dien-1-one.…”

Section: Crystal Structure Of N-2-methoxyphenyl-2-oxo-5-nitro-1-benzymentioning

confidence: 99%

Crystal Structure of N-2-Methoxyphenyl-2-oxo-5-nitro-1-benzylidene-methylamine

et al. 2008

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Schiff bases are of interest because they are known to show photochromism and thermochromism in the solid state; this may involve reversible proton transfer from the hydroxyl-O atom to the imine-N atom. Interest in studies on photochromic compounds has been increasing ever since the potential application of photochromic materials was realized in various areas, such as control and measurement of the radiation intensity, optical computers and display systems. Crystals of N-2-methoxyphenyl-2-oxo-5-nitro-1-benzylidene-methylamine suitable for X-ray analysis were obtained from ethyl acetate by slow evaporation (yield %, 71; m.p., 461 -465 K).The molecular data were collected on a Stoe IPDS II diffractometer using Mo Ka radiation at room temperature. For the title compound data collection, X-AREA; cell refinement, X-AREA; data reduction, X-RED32; program used to solve the structure, SHELXS97; 2 program used to refine the structure, SHELXL97; 2 molecular figures, ORTEP III; 3 publication software, WinGX 4 and PARST. 5 The structure was solved by direct methods with SHELXS-97 and refined by full-matrix least-squares procedures on F 2 , using the program SHELXL-97, a computer program belonging to the WinGX software package. Atoms H1A1 and H1B1, bonded to N1A and N1B and involved in hydrogen bonding, were found in a difference Fourier map and refined freeyl. All other H atoms were placed at calculated positions and refined as a riding model. The Rint value was obtained to be slightly high because of the intensity data X-ray Structure Analysis Online Crystal Structure of N-2-Methoxyphenyl-2-oxo-5-nitro-1-benzylidenemethylamineHasan TANAK,* † Ferda ERíAHˆN,** Erbil A˝AR,*** Orhan BüYüKGüNGöR,* and Metin YAVUZ* The crystal structure of the title compound, C14H12N2O4, was determined by a single-crystal X-ray diffraction technique, (Fig. 1). The title compound crystallizes in the orthorhombic space group Pca21 with the following unit-cell parameters: a = 18.4391 (15)

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“…Les valeurs des longueurs de liaison (Tableau 2) sont compatibles avec celles trouvEes dans des composes de la mEme famille (Bregman, Leiserowitz & Osaki, 1964;Bregman, Leiserowitz & Schmidt, 1964; MoustakaliMavridis, Hadjoudis & Mavridis, 1978, 1980Hadjoudis, Vittarakis & Moustakali-Mavridis, 1987;Lindeman, Shklover, Struchkov, Kravcheny & Potapov, 1982;Mansilla-Koblavi, TourE, Lapasset, Carles & Bodot, 1989) et sont conformes h celles proposEes par Allen et al (1987). Pour ce type de compose susceptible de manifester le phEnom~ne de tautomErie, les distances…”

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