Design and synthesis of reversible solid-state photochromic pyrazolones by introducing a pyridine ring

2016 ◽  
Vol 15 (10) ◽  
pp. 1222-1226 ◽  
Author(s):  
Jixi Guo ◽  
Yucai Zhang ◽  
Dianzeng Jia ◽  
Mingxi Guo ◽  
Yinhua Li
Keyword(s):  
Solid State ◽  
Pyridine Ring ◽  
Design And Synthesis ◽  
Pyrazolone Derivatives ◽  
Fluorescence Switching

Reversible fluorescence switching materials based on solid-state photochromic pyrazolone derivatives have been successfully synthesized by introducing a pyridine ring.

Complexation of 7-azaindole by the methylmercury(II) cation

1992 ◽  
Vol 70 (12) ◽  
pp. 2914-2921 ◽  
Author(s):  
Nathalie Dufour ◽  
Anne-Marie Lebuis ◽  
Marie-Claude Corbeil ◽  
André L. Beauchamp ◽  
Pascal Dufour ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectra ◽  
Pyridine Ring ◽  
Coordination Mode ◽  
Pyrrole Ring ◽  
Chemical Shifts ◽  
Lone Pair ◽  
Major Influence ◽  
Large Displacements ◽  
Dmso Solution

Complexes of the types [CH3Hg(aza)], [CH3Hg(Haza)]X, and [(CH3Hg)2(aza)]X are obtained by reacting CH3HgOH and/or CH3HgX (X = NO3, ClO4) with 7-azaindole (Haza). The weakly acidic N1-H proton on the pyrrole ring is displaced by the hydroxide, whereas the perchlorate and nitrate salts lead to CH3Hg+ coordination to the N7 lone pair on the pyridine ring. Detailed analysis of the infrared spectra of the complexes and their N-deuterated derivatives provides diagnostic regions for eventual prediction of the coordination mode in other systems. All compounds are characterized by means of 1H, 13C, and 199Hg NMR spectra in DMSO solution and solid-state CP-MAS 13C spectra. Comparison of the solution and solid-state 13C spectra show that the species present in the solids remain undissociated in DMSO. Each type of complex can be identified from a characteristic pattern of large displacements of the ligand 13C signals. The 1H spectra are less informative because substitution of the N1-H proton by CH3Hg+ induces only minor shifts. Metal solvation appears to have a major influence on the 13C and 199Hg chemical shifts of the CH3Hg+ groups.

Structural diversity of new solid-state luminophores based on quinoxaline-β-ketoiminate boron difluoride complexes with remarkable fluorescence switching properties

2015 ◽  
Vol 51 (13) ◽  
pp. 2656-2659 ◽  
Author(s):  
Chia-Wei Liao ◽  
Rajeswara Rao M. ◽  
Shih-Sheng Sun
Keyword(s):  
Solid State ◽  
Structural Diversity ◽  
Acid Base ◽  
Fluorescence Switching ◽  
Solid State Fluorescence ◽  
Boron Difluoride

Highly tunable organoboron luminophores with intense solid-state fluorescence showed outstanding photoswitching properties modulated by acid/base vapors.

scholarly journals Crystal structures of 4-chloropyridine-2-carbonitrile and 6-chloropyridine-2-carbonitrile exhibit different intermolecular π-stacking, C—H...Nnitrileand C—H...Npyridineinteractions

2015 ◽  
Vol 71 (7) ◽  
pp. 852-856 ◽  
Author(s):  
Matthew J. Montgomery ◽  
Thomas J. O'Connor ◽  
Joseph M. Tanski
Keyword(s):  
Solid State ◽  
Crystal Structures ◽  
Pyridine Ring ◽  
Nitrile Group ◽  
Two Dimensional ◽  
One Dimensional ◽  
Face To Face ◽  
Π Stacking

The two title compounds are isomers of C6H3ClN2containing a pyridine ring, a nitrile group, and a chloro substituent. The molecules of each compound pack together in the solid state with offset face-to-face π-stacking, and intermolecular C—H...Nnitrileand C—H...Npyridineinteractions. 4-Chloropyridine-2-carbonitrile, (I), exhibits pairwise centrosymmetric head-to-head C—H...Nnitrileand C—H...Npyridineinteractions, forming one-dimensional chains, which are π-stacked in an offset face-to-face fashion. The intermolecular packing of the isomeric 6-chloropyridine-2-carbonitrile, (II), which differs only in the position of the chloro substituent on the pyridine ring, exhibits head-to-tail C—H...Nnitrileand C—H...Npyridineinteractions, forming two-dimensional sheets which are π-stacked in an offset face-to-face fashion. In contrast to (I), the offset face-to-face π-stacking in (II) is formed between molecules with alternating orientations of the chloro and nitrile substituents.

Halogen Atom and Position Dependent Strong Enhancement of Solid‐State Fluorescence and Stimuli Responsive Reversible Fluorescence Switching

2019 ◽  
Vol 4 (13) ◽  
pp. 3884-3890 ◽  
Author(s):  
Parthasarathy Gayathri ◽  
Subramanian Karthikeyan ◽  
Dohyun Moon ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Solid State ◽  
Halogen Atom ◽  
Stimuli Responsive ◽  
Strong Enhancement ◽  
Fluorescence Switching ◽  
Solid State Fluorescence

Photochromism of New Hybrid Diarylethenes Bearing a Thiophene and Isoxazole Moiety

2011 ◽  
Vol 239-242 ◽  
pp. 1657-1660
Author(s):  
Ren Jie Wang ◽  
Shou Zhi Pu ◽  
Shi Qiang Cui
Keyword(s):  
Solid State ◽  
Uv Light ◽  
Optical Storage ◽  
Fluorescent Properties ◽  
Fluorescence Switching ◽  
Hexane Solution

A new photochromic diarylethene compound 1-[2-methyl-3-thienyl]-2-[3, 5-dimethyl-4-isoxazolyl]perfluorocyclopentene (1o), was synthesized and its photochromic and fluorescent properties were investigated. Diarylethene 1o changed the color from colorless to orange upon irraditation with 297 nm UV light, which the absorption maxima were observed at 486 nm in hexane solution. This new photochromic system also showed remarkable fluorescence switching in the solid state. Finally, rewritable optical storage using 1o was performed. The results demonstrated that the compound was very sensitive responding to 633 nm recording laser.

Design and synthesis of solid state structures with conjugate acid–base pair interactions

CrystEngComm ◽  
2012 ◽  
Vol 14 (11) ◽  
pp. 3851 ◽  
Author(s):  
Sathyanarayana Reddy Perumalla ◽  
Changquan Calvin Sun
Keyword(s):  
Solid State ◽  
Base Pair ◽  
Acid Base ◽  
Design And Synthesis ◽  
Conjugate Acid ◽  
Solid State Structures ◽  
Pair Interactions

scholarly journals Spiropyran salts and their neutral precursors: synthesis, crystal structure, photochromic transformations in solutions and solid state

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
E.A. Yurieva ◽  
S.M. Aldoshin
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Pyridine Ring ◽  
Photochromic Properties ◽  
X Ray ◽  
Photochromic Transformations ◽  
The Relationship

AbstractThis review covers investigations of spiropyran iodides with N-substituted indoline fragment, and with the pyran cycle being annelated to N-methylated pyridine ring. The schemes of synthesis of iodides and their neutral precursors, as well as results of X-ray analysis and photochemical study of the crystals of the obtained compounds are presented. Based on our and literature data, the relationship between the structure and photochromic properties has been discussed for a series of salts and neutral pyridospiropyrans.

Aggregation-enhanced emissive mechanofluorochromic carbazole-halogen positional isomers: tunable fluorescence via conformational polymorphism and crystallization-induced fluorescence switching

CrystEngComm ◽  
2019 ◽  
Vol 21 (43) ◽  
pp. 6604-6612 ◽  
Author(s):  
Parthasarathy Gayathri ◽  
Subramanian Karthikeyan ◽  
Mehboobali Pannipara ◽  
Abdullah G. Al-Sehemi ◽  
Dohyun Moon ◽  
...  
Keyword(s):  
Solid State ◽  
Positional Isomers ◽  
Conformational Polymorphism ◽  
Fluorescence Switching ◽  
Solid State Fluorescence

The conformational twist of the carbazole-halogen positional isomers produced blue and green polymorphs with tunable solid-state fluorescence and demonstrated mechanofluorochromism.

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