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Schiavone DV, Gallardo J, Kapkayeva DM, Baucom JC, Murelli RP. Lactam-fused tropolones: a new tunable, environmentally sensitive fluorophore class. Org Biomol Chem 2023; 21:7900-7907. [PMID: 37750360 DOI: 10.1039/d3ob01263h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Fluorescent small-molecules capable of altering their profiles in response to environmental changes are exceptionally valuable tool compounds throughout the scientific community. The following manuscriipt describes a new class of fluorescent small molecules based on lactam-fused tropolones that are responsive to a dynamic range of environmental changes. These molecules can be easily obtained through a rapid annulation procedure between appropriately functionalized tropolones and primary amines, which is often complete within minutes at room temperature. Molecules generated through this approach have been identified with fluoresence emission across the visible light spectra, and can be tuned based on either the tropolone or amine component. They are also highly responsive to changes in solvent, pH, and certain divalent metal ions. Tropolone-fused lactams thus represent a new class of tunable fluorescent small molecules that could find value throughout the scientific community.
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Affiliation(s)
- Daniel V Schiavone
- Department of Chemistry and Biochemistry, Brooklyn College, The City University of New York, Brooklyn, New York, USA.
- PhD Program in Chemistry, The Graduate Center, The City University of New York, New York, NY, USA
| | - Joel Gallardo
- Department of Chemistry and Biochemistry, Brooklyn College, The City University of New York, Brooklyn, New York, USA.
- PhD Program in Chemistry, The Graduate Center, The City University of New York, New York, NY, USA
| | - Diana M Kapkayeva
- Department of Chemistry and Biochemistry, Brooklyn College, The City University of New York, Brooklyn, New York, USA.
| | - John-Charles Baucom
- Department of Chemistry and Biochemistry, Brooklyn College, The City University of New York, Brooklyn, New York, USA.
- PhD Program in Chemistry, The Graduate Center, The City University of New York, New York, NY, USA
| | - Ryan P Murelli
- Department of Chemistry and Biochemistry, Brooklyn College, The City University of New York, Brooklyn, New York, USA.
- PhD Program in Chemistry, The Graduate Center, The City University of New York, New York, NY, USA
- PhD Program in Biochemistry, The Graduate Center, The City University of New York, New York, NY, USA
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Xie F, Mahendiran S, Seifert NA, Xu Y. Modifying conformational distribution of chiral tetrahydro-2-furoic acid through its interaction with water: a rotational spectroscopic and theoretical investigation. Phys Chem Chem Phys 2021; 23:3820-3825. [PMID: 33533340 DOI: 10.1039/d0cp06265k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Rotational spectrum of a binary complex formed between tetrahydro-2-furoic acid (THFA) and water was measured using a chirped pulse Fourier transform microwave spectrometer. A comprehensive theoretical conformational search procedure was carried out using CREST, a conformational searching tool, and DFT calculations to aid the spectral assignment and interpretation. The final conformer ensemble is classified into two structural groups: Type 1 conformers showing a classic carboxylic acid monohydrate structure with two strong hydrogen-bonds formed between the COOH group of cis-THFA and water, and the much less stable Type 2 conformers with trans-THFA and weaker intermolecular interactions with water. The 'cis-' and 'trans-' labels refer to the configurations where the carboxylic C[double bond, length as m-dash]O and OH functional groups are on the same or opposite side, respectively. Only the two most stable Type 2 conformers containing trans-THFA I and II were observed experimentally in a neon jet expansion with an abundance ratio of 1 : 1. This relative abundance observation differs greatly from that of the THFA monomer, i.e. with trans-THFA I : trans-THFA II : cis-THFA III of 10 : 1 : 1 in a neon jet expansion, reported previously. The observation indicates a kinetically controlled formation process of different types of the monohydrates in a jet expansion, whereas a thermodynamically controlled process dominates within each type of structures. The relative stability of the THFA ring conformations is altered by interaction with water, showing a noticeable water induced conformational preference.
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Affiliation(s)
- Fan Xie
- Chemistry Department, The University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
| | | | - Nathan A Seifert
- Chemistry Department, The University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
| | - Yunjie Xu
- Chemistry Department, The University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
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Yang G, Chen K, Wang G, Yang D. TDDFT investigation on electronically excited-state hydrogen-bonding properties and ESIPT mechanism for the 2-(1H-imidazol-2-yl)-phenol compound. Struct Chem 2020. [DOI: 10.1007/s11224-020-01648-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Vealey ZN, Foguel L, Vaccaro PH. Hydrogen-Bonding Motifs and Proton-Transfer Dynamics in Electronically Excited 6-Hydroxy-2-formylfulvene. J Phys Chem A 2019; 123:6506-6526. [DOI: 10.1021/acs.jpca.9b05025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zachary N. Vealey
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Lidor Foguel
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
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Vealey ZN, Foguel L, Vaccaro PH. Spectral Signatures of Proton-Transfer Dynamics at the Cusp of Low-Barrier Hydrogen Bonding. J Phys Chem Lett 2018; 9:4949-4954. [PMID: 30101590 DOI: 10.1021/acs.jpclett.8b02199] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Despite their importance in diverse chemical and biochemical processes, low-barrier hydrogen bonds remain elusive targets to classify and interpret spectroscopically. Here the correlated nature of hydrogen bonding and proton transfer in the low-barrier regime has been probed for the ground and excited electronic states of 6-hydroxy-2-formylfulvene by acquiring jet-cooled fluorescence spectra of the parent and monodeuterated isotopologs. While excited-state profiles reveal regular vibronic patterns devoid of obvious dynamical signatures, their ground-state counterparts display a radically altered energy landscape characterized by spectral bifurcations comparable in magnitude to typical vibrational spacings (>100 cm-1). Quantitative analyses yield unusual deuterium kinetic isotope effects that straddle limiting values attributed to above-barrier vibration and below-barrier tunneling of the proton adjoining donor/acceptor sites. Our findings provide compelling experimental evidence for ultrafast hydron-migration events commensurate with the onset of low-barrier hydrogen bonding and afford a trenchant glimpse of molecular phenomena taking place at the "tipping point" between disparate dynamical regimes.
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Affiliation(s)
- Zachary N Vealey
- Department of Chemistry , Yale University , New Haven , Connecticut 06520-8107 United States
| | - Lidor Foguel
- Department of Chemistry , Yale University , New Haven , Connecticut 06520-8107 United States
| | - Patrick H Vaccaro
- Department of Chemistry , Yale University , New Haven , Connecticut 06520-8107 United States
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Brela MZ, Wójcik MJ, Boczar M, Witek ŁJ, Yonehara T, Nakajima T, Ozaki Y. Proton dynamics in crystalline tropolone studied by Born-Oppenheimer molecular simulations. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.07.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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