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Al-Shamsi N, Laptenok SP, Bufaroosha MS, Greish YE, Saleh N. Time-resolved photoluminescence of 6-thienyl-lumazine fluorophores in cellulose acetate nanofibers for detection of mercury ions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 222:117189. [PMID: 31177004 DOI: 10.1016/j.saa.2019.117189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 05/21/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
Time-resolved photoluminescence measurements were used to characterize the photophysical properties of 6-thienyllumazine (TLm) fluorophores in cellulose acetate nanofibers (NFs) in the presence and absence of mercuric acetate salts. In solution, excited-state proton transfer (ESPT) from TLm to water molecules was investigated at pH from 2 to 12. The insertion of thienyl group into lumazine introduces cis and trans conformers while keeping the same tautomerization structures. Global and target analyses were employed to resolve the true emission spectra of all prototropic, tautomeric, and rotameric species for TLm in water. The results support the premise that only the cis conformers are related to the ESPT process. However, no ESPT from TLm to a nearby water molecule was observed in NFs. The addition of NFs increases the excited-state lifetime of TLm in the solid state because of combined polarity/confinement effects. The solid-state fluorescence of TLm (in NFs) was quenched by mercuric acetate through different mechanisms-dynamic and static-depending on the applied pressure-atmospheric and vacuum, respectively. The new solid-state sensor is simple, ecofriendly, and instantly fabricated. TLM-loaded NFs can detect mercuric ions at a concentration of 50 picomolar. The formation of non-fluorescent ground-state complex between TLm molecules and mercuric ions inside the pores of NFs was achieved under vacuum condition.
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Affiliation(s)
- Noura Al-Shamsi
- Chemistry Department, College of Science, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates
| | - Sergey P Laptenok
- Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, P.O. Box 4700, Thuwal 23955-6900, Saudi Arabia
| | - Muna S Bufaroosha
- Chemistry Department, College of Science, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates
| | - Yaser E Greish
- Chemistry Department, College of Science, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates
| | - Na'il Saleh
- Chemistry Department, College of Science, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates.
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Mamedov VA, Zhukova NA, Gubaidullin AT, Syakaev VV, Kadyrova MS, Beschastnova TN, Bazanova OB, Rizvanov IDK, Latypov SK. One-Pot Synthesis of 7-(Benzimidazol-2-yl)thioxolumazine and -lumazine Derivatives via H 2SO 4-Catalyzed Rearrangement of Quinoxalinones When Exposed to 5,6-Diamino-2-mercapto- and 2,5,6-Triaminopyrimidin-4-ols. J Org Chem 2018; 83:14942-14953. [PMID: 30431276 DOI: 10.1021/acs.joc.8b02161] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile approach to a range of substituted 7-(benzimidazol-2-yl)thioxolumazines [7-(benzimidazol-2-yl)-2-thioxo-2,3-dihydropteridin-4(1 H)-ones] and 7-(benzimidazol-2-yl)lumazines [7-(benzimidazol-2-yl)pteridine-2,4(1 H,3 H)-diones] is described. These new biheterocyclic systems are obtained via H2SO4-catalyzed rearrangement of quinoxalin-2-ones in the presence of 5,6-diamino-2-mercapto- and 2,5,6-triaminopyrimidin-4-ols. Thus, benzimidazole and pteridine rings are constructed in one synthetic step. A plausible ANRORC ( addition of nucleophile, ring opening and ring closure)-type reaction mechanism is proposed. Applying the rearrangement to the aza-analogue of 3-benzoylquinoxalin-2(1 H)-one-i.e., 3-benzoylpyrido[2,3- b]pyrazin-2(1 H)-one-with 5,6-diamino-2-mercaptopyrimidin-4-ol makes it possible to synthesize inaccessible 7-(1 H-imidazo[4,5- b]pyridin-2-yl)-6-phenyl-2-thioxo-2,3-dihydropteridin-4(1 H)-one. 7-(Benzimidazol-2-yl)-6-(2-fluorophenyl)-2-thioxo-2,3-dihydropteridin-4(1 H)-ones undergoes intramolecular nucleophilic substitution of fluorine by a nitrogen of the benzimidazole fragment with the formation of benzo[4',5']imidazo[1',2':1,2]quinolino[4,3- g]pteridine-2,4(1 H,3 H)-diones as new heterocyclic systems.
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Affiliation(s)
- Vakhid A Mamedov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Nataliya A Zhukova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Aidar T Gubaidullin
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Victor V Syakaev
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Milyausha S Kadyrova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Tat'yana N Beschastnova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Olga B Bazanova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Il Dar Kh Rizvanov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Shamil K Latypov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
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Goswami S, Das MK, Sain D, Goswami B. A concise treatment of pterins: some recent synthetic and methodology aspects and their applications in molecular sensors. Pteridines 2018. [DOI: 10.1515/pteridines-2018-0002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Abstract
A concise account of pterins in chemistry and biology and their applications in molecular sensors including their optical spectroscopic properties are described. Different natural, synthetic, biological and photophysical aspects are also discussed. Synthetic access to direct functionalised pterins and a recently reported new thiophene annulation technique are described for the synthesis of Form B of molybdenum cofactor. The receptor properties of fluorescent pterin molecules including selenopyrimidines which are rarely reported for their binding of anions and neutral molecules are also of major importance in this review. For such an old and still so young, unexplored pterin system on its power to be sensitive for physical studies especially the interaction with cations, anions and neutral molecules are fascinating and research in this area is relatively new and expected to increase fast. Pterin based receptors are for the first time put into a useful review for the advantage of those who want to explore pterin and modified pterin as chromogenic and fluorogenic sensors.
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Affiliation(s)
- Shyamaprosad Goswami
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal , India
| | - Manas Kumar Das
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal , India
| | - Dibyendu Sain
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal , India
| | - Bhaswati Goswami
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal , India
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Wierzchowski J. Excited-state proton transfer and phototautomerism in nucleobase and nucleoside analogs: a mini-review. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2015; 33:626-44. [PMID: 25105453 DOI: 10.1080/15257770.2014.913065] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Intermolecular excited-state proton transfer (ESPT) has been observed in several fluorescent nucleobase and/or nucleoside analogs. In the present work, some new examples of ESPT in this class of compounds are presented together with a brief recapitulation of the previously published data. The nucleobases, nucleosides, and their analogs contain many basic and acidic centers and therefore their ESPT behavior may be complex. To interpret the complex data, it is usually necessary to determine the microscopic pK* values for each (or most) of the possible ESPT centers. Typical approach to solve this problem is by analysis of the alkyl derivatives, in which the possibility of the ESPT is reduced. Of particular interest are examples of "phototautomerization via the cation," observed in several systems, which in the neutral media do not undergo ESPT. Protonation of the molecule in the ground state facilitates the two-step phototautomerism in several systems, including formycin A and 2-amino-8-azadenine. Fluorescence of the nucleobase and nucleoside analogs undergoing ESPT is usually solvent-, isotope-, and buffer-ion sensitive, and in some systems the ESPT can be promoted by environmental factors, e.g., the presence of buffer ions. This sensitivity to the microenvironment parameters makes the ESPT systems potentially useful for biological applications.
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Affiliation(s)
- Jacek Wierzchowski
- a Department of Biophysics , University of Varmia & Masuria in Olsztyn , Olsztyn , Poland
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Liu L, Yang D, Li P. pH-Related and Site-Specific Excited-State Proton Transfer from Pterin to Acetate. J Phys Chem B 2014; 118:11707-14. [DOI: 10.1021/jp5082017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Lei Liu
- State Key Laboratory of Molecular
Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- State Key Laboratory
of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Dapeng Yang
- State Key Laboratory of Molecular
Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Physics Laboratory, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
| | - Peng Li
- State Key Laboratory of Molecular
Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Afaneh AT, Schreckenbach G. Conformation/Tautomerization effect on the pKa
values of lumazine and 6-thienyllumazine. J PHYS ORG CHEM 2014. [DOI: 10.1002/poc.3320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Akef T. Afaneh
- Department of Chemistry; University of Manitoba; Winnipeg MB Canada R3T 2N2
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