Matthew J. Tucker

Structure revision of scytonemin imine and its relationship to scytonemin chromism and cyanobacterial adaptability

G. Larson, Tanzil Mahmud, Ilya D. Dergachev, Casey S. Philbin et autres

Scytonemin, a UV-protective pigment produced by cyanobacteria, is essential for microbial survival under extreme solar radiation. Recent studies suggest its structural analog, scytonemin imine, may serve as a biosynthetic marker for cyanobacteria exposed to intense light. Here, we present a structural revision, …

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UVC-Intense Exoplanets May Not Be Uninhabitable: Evidence from a Desert Lichen

Tejinder P. Singh, Christos D. Georgiou, Christopher S. Jeffrey, Matthew J. Tucker et autres

Many of the recently discovered Earth-like exoplanets are hosted by M and F stars, stars that emit intense UVC, especially during a flare. We studied whether such planets are nevertheless habitable by irradiating a desert lichen, Clavascidium lacinulatum, with 254-nm 55 W/m …

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Anharmonically Coupled Vibrational Scaffolds for Energy Dissipation in a Terpyridine-Aldehyde Ligand

Christopher J. Mallon, Majid Hassani, Maksym Fizer, Sergey A. Varganov et autres

The role of intramolecular vibrational energy redistribution is critical when considering the thermal properties of coordination complexes. The interactions and redistribution of vibrational energy can be uncovered through the use of two-dimensional infrared (2D IR) spectroscopy by observing the cross-peaks between different …

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Revision of the Structure of Scytonemin Imine and Its Relationship to Scytonemin: Chromism and Implications for Astrobiology and Cyanobacterial Adaptability

G. Larson, Tanzil Mahmud, Ilya D. Dergachev, Casey S. Philbin et autres

Scytonemin, a UV-protective pigment produced by cyanobacteria, is essential for microbial survival under extreme solar radiation. Recent studies suggest its structural analog, scytonemin imine, may serve as a biosynthetic marker for cyanobacteria exposed to intense light. Here, we present a structural revision, …

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Modulating vibrational energy redistribution in highly conjugated systems

Majid Hassani, Pathick Halder Shaon, Christopher J. Mallon, Tianjiao Shi et autres

Elucidating the nature of intramolecular vibrational energy redistribution (IVR) can guide the design of molecular wires. The ability to steer these processes through a mechanistic understanding of IVR is assessed by utilizing two-dimensional infrared (2D IR) spectroscopy. 2D IR spectroscopy allows for …

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Unraveling Hydration Shell Dynamics and Viscosity Effects Around Cyanamide Probes via 2D IR Spectroscopy

Christopher J. Mallon, Majid Hassani, Ellia H. Osofsky, Savannah B. Familo et autres

Hydration dynamics and solvent viscosity play critical roles in the structure and function of biomolecules. An overwhelming body of evidence suggests that protein and membrane fluctuations are closely linked to solvent fluctuations. While extensive research exists on the use of vibrational probes …

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The Long and Short of Coupling and Uncoupling via 2D IR Spectroscopy

Matthew J. Tucker, Christopher J. Mallon, Majid Hassani

Determining dynamic structural changes along with the functional movements in biological systems has been a significant challenge for scientists for several decades. Utilizing vibrational coupling with the aid of 2D IR probe pairs has aided in uncovering structural dynamics and functional roles …

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Cortical polysaccharides play a crucial role in lichen UV protection

Tanzil Mahmud, Derek C. Moore, Ilya D. Dergachev, Henry Sun et autres

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Synergistic Photoprotection: Enhanced Stability of Vulpinic Acid through Interaction with Exocellular Polysaccharides

Tanzil Mahmud, Derek C. Moore, Ilya D. Dergachev, Henry Sun et autres

Lichens have been of great interest in exobiological studies due to their remarkable tolerance to ultraviolet (UV) radiation. These organisms employ extracellular pigments for screening high-energy solar radiation, allowing the photosynthetically active radiation to pass through and be utilized by the photosymbiont. …

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Synergistic Photoprotection: Enhanced Stability of Vulpinic Acid through Interaction with Exocellular Polysaccharides

Tanzil Mahmud, Derek C. Moore, Ilya D. Dergachev, Henry Sun et autres

Lichens have been of great interest in exobiological studies due to their remarkable tolerance to ultraviolet (UV) radiation. These organisms employ extracellular pigments for screening high-energy solar radiation, allowing the photosynthetically active radiation to pass through and be utilized by the photosymbiont. …

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Reversible Photochromism of 4,4’‐Disubstituted 2,2’‐Bipyridine in the Presence of SO3

Connor J. Filbin, Md Hasanul Haque, Cameron K. Locke, Christopher J. Mallon et autres

Abstract We report an unusual photochromic behavior of 4,4′‐disubstituted‐2,2′‐bipyridine. It was found that in the presence of a SO3 source and HCl, 2,2′‐bipyridine‐4,4′‐dibutyl ester undergoes a color change from yellow to magenta in solution with maximum absorbance at 545 nm upon irradiation …

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Effects of spectral density on the azide vibrational transition in water versus D2O

Majid Hassani, Derek C. Moore, Matthew G. Roberson, Somnath M. Kashid et autres

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