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New type of tin(IV) complex based turn-on fluorescent chemosensor for fluoride ion recognition: elucidating the effect of molecular structure on sensing property.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 4/28/2024, Vol. 53 Issue 16, p6932-6940, 9p
- Publication Year :
- 2024
-
Abstract
- A novel type of chemosensor based on tin(IV) complexes incorporating hydroxyquinoline derivatives has been designed and investigated for selectively detecting fluoride ions. Sn(meq)<subscript>2</subscript>Cl<subscript>2</subscript> (meq = 2-methyl-8-quinolinol) (complex 1) exhibits a significant enhancement in luminescence upon the introduction of fluoride ions. This enhancement greatly surpasses that observed with Snq<subscript>2</subscript>Cl<subscript>2</subscript> and Sn(dmqo)<subscript>2</subscript>Cl<subscript>2</subscript> (q = 8-hydroxyquinnoline; dmqo = 5,7-dimethyl-8-quinolinol). Furthermore, complex 1 displays excellent sensitivity and selectivity for fluoride detection in comparison to halides and other anions. As a result, complex 1 serves as an outstanding turn-on fluorescent chemosensor, effectively sensing fluoride ions. The Benesi–Hilderbrand method and Job's plot confirmed that complex 1 associates with F<superscript>−</superscript> in a 1 : 2 binding stoichiometry. Also, complex 1 exhibited a large binding constant (pK<subscript>b</subscript> = 10.4 M<superscript>−2</superscript>) and a low detection limit (100 nM). To gain a deeper insight into the photophysical properties and the underlying mechanism governing the formation of the tin(IV) fluoride complex via halide exchange, we successfully synthesized partially fluorinated Sn(meq)<subscript>2</subscript>F<subscript>0.67</subscript>Cl<subscript>1.33</subscript> (2) and fully fluorinated Sn(meq)<subscript>2</subscript>F<subscript>2</subscript> (3), all of which were characterized through computational studies, thereby elucidating their photophysical properties. DFT studies reveal that converting Sn(meq)<subscript>2</subscript>Cl<subscript>2</subscript> to Sn(meq)<subscript>2</subscript>F<subscript>2</subscript>, an endergonic process, leads to greater stability due to reducing steric hindrance about the metal center. Furthermore, the fluorinated complex significantly increases dipole moment, resulting in high affinity toward the F<superscript>−</superscript> ion. [ABSTRACT FROM AUTHOR]
- Subjects :
- MOLECULAR structure
FLUORIDES
TIN
STERIC hindrance
DIPOLE moments
HALIDES
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 53
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 176784906
- Full Text :
- https://doi.org/10.1039/d4dt00461b