Based on six representatives of 2-oxonicotinonitriles, the effect of the nature of the substituent in the fourth position of the pyridine system on the photophysical characteristics was studied. The role of the donor/acceptor nature of the substituent and the solvent nature in the absorbing and fluorescent properties of the compounds was shown.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9746578 | PMC |
http://dx.doi.org/10.1134/S1070363222110366 | DOI Listing |
Bioorg Chem
December 2024
School of Pharmacy, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan. Electronic address:
Septin 9 (SEPT9), a GTPase, known as the fourth cytoskeleton, is widely expressed in various cells and tissues. The functions of SEPT9 are partly similar to other cytoskeletons as a structure protein. Further, SEPT9 can interact with other cytoskeletons, participating in actin dynamics and microtubule regulation.
View Article and Find Full Text PDFJ Am Chem Soc
November 2024
Department of Chemistry, Stanford University, Stanford, California 94305, United States.
When multiple reaction steps occur before thermal equilibration, kinetic energy from one reaction step can influence overall product distributions in ways that are not well predicted by transition state theory. An understanding of how the structural features of mechanophores, such as substitutions, affect reactivity, product distribution, and the extent of dynamic effects in the mechanochemical manifolds is necessary for designing chemical reactions and responsive materials. We synthesized two tetrafluorinated [4]-ladderanes with fluorination on different rungs and found that the fluorination pattern influenced the force sensitivity and stereochemical distribution of products in the mechanochemistry of these fluorinated ladderanes.
View Article and Find Full Text PDFOrg Lett
October 2024
The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, No. 28 West Xianning Road, Xi'an, 710049, People's Republic of China.
We report new photoluminescent switching systems achieved through pH-induced intramolecular oxa-Michael conjugate addition reactions. Ratiometric absorbance and fluorescence emission were observed across conjugate acceptors triggered by pH, resulting in specific pseudo p values. The effect of substituents on the pseudo p's was investigated, showing increased values from electron-withdrawing to electron-donating groups.
View Article and Find Full Text PDFInorg Chem
October 2024
Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou Key Lab of Advanced Energy Storage and Conversion, Zhejiang Province Key Lab of Leather Engineering, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
Substituents are widespread in chemistry, but it has remained quite difficult to reliably determine the thermodynamic and kinetic stabilities of substituted compounds, though they are key to helping establish a structural rule and synthetic viability, respectively. As an important class of valence isomers in the benzene family, benzvalene-like structures have been extensively studied in systems associated with electron-neutral (i.e.
View Article and Find Full Text PDFActa Crystallogr C Struct Chem
September 2024
Department of Chemistry, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI 54481, USA.
The structures of a series of 2:1 cocrystals formed between 4-(dimethylamino)pyridine and each of 1,2,4,5-tetrachloro-3,6-diiodobenzene, 2CHN·CClI, 1,2,4,5-tetrabromo-3,6-diiodobenzene, 2CHN·CBrI, 1-bromo-4-iodo-2,3,5,6-tetrafluorobenzene, 2CHN·CBrFI, and 1,2-dibromo-4,5-difluoro-3,6-diiodobenzene, 2CHN·CBrFI, are reported. In all five structures, the core halogen-bonded 2:1 trimolecular units have geometrically similar parameters, with the central halogen-bond donor flanked by two pyridine halogen-bond acceptors twisted with respect to the central halogen-bond donor at angles ranging from 76 to 86°. The I.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!