Shape-Shifting Molecules: Photoisomerization Action Spectroscopy

Probing Colossal Carbon Rings

Samuel JP Marlton, Jack T Buntine, Patrick Watkins, Chang Liu, Ugo Jacovella, Eduardo Carrascosa, James N Bull, Evan J Bieske

2023-01-26

Carbon aggregates containing between 10 and 30 atoms preferentially arrange themselves as planar rings. To learn more about this e..

Excited-State Barrier Controls E ? Z Photoisomerization in p-Hydroxycinnamate Biochromophores

Eleanor K Ashworth, Neville JA Coughlan, W Scott Hopkins, Evan J Bieske, James N Bull

2022-09-23

Molecules based on the deprotonated p-hydroxycinnamate moiety are widespread in nature, including serving as UV filters in the lea..

Disentangling Electronic Spectra of Linear and Cyclic Hydrogenated Carbon Cluster Cations, C2n 1H (n=3-10)

Samuel JP Marlton, Jack T Buntine, Chang Liu, Patrick Watkins, Ugo Jacovella, Eduardo Carrascosa, James N Bull, Evan J Bieske

2022-09-15

Electronic spectra are measured for protonated carbon clusters (C2n+1H+) containing between 7 and 21 carbon atoms. Linear and cycl..

Photo-induced 6 pi-electrocyclisation and cycloreversion of isolated dithienylethene anions

Jack T Buntine, Eduardo Carrascosa, James N Bull, Giel Muller, Ugo Jacovella, Christopher R Glasson, George Vamvounis, Evan J Bieske

2022-06-23

The diarylethene chromophore is commonly used in light-triggered molecular switches. The chromophore undergoes reversible 6π-elect..

An ion mobility mass spectrometer coupled with a cryogenic ion trap for recording electronic spectra of charged, isomer-selected clusters

Jack T Buntine, Eduardo Carrascosa, James N Bull, Ugo Jacovella, Mariah I Cotter, Patrick Watkins, Chang Liu, Michael S Scholz, Brian D Adamson, Samuel JP Marlton, Evan J Bieske

2022-04-01

Infrared and electronic spectra are indispensable for understanding the structural and energetic properties of charged molecules a..

Photodissociation dynamics of N-3( )

Sarbani Patra, Juan Carlos San Vicente Veliz, Debasish Koner, Evan J Bieske, Markus Meuwly

2022-03-28

The photodissociation dynamics of N3 + excited from its (linear) 3Σg -/(bent) 3A″ ground to the first excited singlet and triplet ..

Nonadiabatic Dynamics between Valence, Nonvalence, and Continuum Electronic States in a Heteropolycyclic Aromatic Hydrocarbon

James N Bull, Cate S Anstoter, Mark H Stockett, Connor J Clarke, Jemma A Gibbard, Evan J Bieske, Jan RR Verlet

2021-12-16

Internal conversion between valence-localized and dipole-bound states is thought to be a ubiquitous process in polar molecular ani..

Electronic spectra of positively charged carbon clusters-C-2n( ) (n=6-14)

Jack T Buntine, Mariah I Cotter, Ugo Jacovella, Chang Liu, Patrick Watkins, Eduardo Carrascosa, James N Bull, Luke Weston, Giel Muller, Michael S Scholz, Evan J Bieske

2021-12-07

Electronic spectra are measured for mass-selected C2n +(n = 6-14) clusters over the visible and near-infrared spectral range throu..

Photoisomerization of Linear and Stacked Isomers of a Charged Styryl Dye: A Tandem Ion Mobility Study

Eduardo Carrascosa, James N Bull, Emilio Martinez-Nunez, Michael S Scholz, Jack T Buntine, Evan J Bieske

2021-12-01

The photoisomerization behavior of styryl 9M, a common dye used in material sciences, is investigated using tandem ion mobility sp..

Action spectroscopy of isomer-selected luciferin anions

Christina Kjaer, James N Bull, Eduardo Carrascosa, Steen Brondsted Nielsen, Evan J Bieske

2021-03-01

Abstract: Luciferin molecules are common luminophores found throughout the biological kingdoms. Here, electrospray ionization and ..

Action spectroscopy of deprotomer-selected hydroxycinnamate anions

James N Bull, Jack T Buntine, Eduardo Carrascosa, Mark H Stockett, Evan J Bieske

2021-02-24

Abstract: Tandem ion mobility mass spectrometry-coupled laser excitation is used to record photodetachment, photoisomerization and..

Electronic Spectrum of the Tropylium Cation in the Gas Phase

Ugo Jacovella, Michael S Scholz, Evan J Bieske

2020-10-15

The structure and properties of the tropylium cation (C7H7+) have enthralled chemists since the prediction by Hückel in 1931 of th..

Photophysics of Isolated Rose Bengal Anions

Mark H Stockett, Christina Kjaer, Steven Daly, Evan J Bieske, Jan RR Verlet, Steen Brondsted Nielsen, James N Bull

2020-10-15

Dye molecules based on the xanthene moiety are widely used as fluorescent probes in bioimaging and technological applications due ..

Photo- and Collision-Induced Isomerization of a Charge-Tagged Norbornadiene-Quadricyclane System

Ugo Jacovella, Eduardo Carrascosa, Jack T Buntine, Nicolai Ree, Kurt Mikkelsen, Martyn Jevric, Kasper Moth-Poulsen, Evan J Bieske

2020-08-06

Molecular photoswitches based on the norbornadiene–quadricylane (NBD–QC) couple have been proposed as key elements of molecular so..

N-3( ): Full-dimensional ground state potential energy surface, vibrational energy levels, and dynamics

Debasish Koner, Max Schwilk, Sarbani Patra, Evan J Bieske, Markus Meuwly

2020-07-28

The fundamental vibrational frequencies and higher vibrationally excited states for the N+3 ion in its electronic ground state hav..

Electronic Spectrum and Photodissociation Chemistry of the 1-Butyn-3-y1 Cation, H3CCHCCFI

Giel Muller, Ugo Jacovella, Katherine J Catani, Gabriel da Silva, Evan J Bieske

2020-03-26

The B̃1A' ← X̃1A' electronic spectra of the 1-butyn-3-yl cation (H3CCHCCH+) and the H3CCHCCH+-Ne and H3CCHCCH+-Ar complexes are me..

Near-infrared reversible photoswitching of an isolated azobenzene-stilbene dye

Eduardo Carrascosa, James N Bull, Jack T Buntine, Gabriel da Silva, Paulo F Santos, Evan J Bieske

2020-02-16

Photoswitching of a charged azobenzene-stilbene dye is investigated through laser excitation in a tandem ion mobility mass spectro..

Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light

Eduardo Carrascosa, Christian Petermayer, Michael S Scholz, James N Bull, Henry Dube, Evan J Bieske

2020-01-21

Indigoid chromophores have emerged as versatile molecular photoswitches, offering efficient reversible photoisomerization upon exp..

Structural characterization and gas-phase studies of the [Ag10H8(L)(6)](2 ) nanocluster dication

Howard Z Ma, Alasdair McKay, Antonia Mravak, Michael S Scholz, Jonathan M White, Roger J Mulder, Evan J Bieske, Vlasta Bonacic-Koutecky, Richard AJ O'Hair

2019-12-21

The reactions between silver salts and borohydrides produce a rich set of products that range from discrete mononuclear compounds ..

Electronic Spectra of Diacetylene Cations (HC4H ) Tagged with Ar and N-2

Giel Muller, Katherine J Catani, Michael S Scholz, Ugo Jacovella, Nastasia Bartlett, Evan J Bieske

2019-08-22

Electronic spectra of mass-selected HC4H+-Arn (n = 1-3) and HC4H+-(N2)n (n = 1-2) complexes are measured over the 290-530 nm range..

Photodetachment and photoreactions of substituted naphthalene anions in a tandem ion mobility spectrometer

James N Bull, Jack T Buntine, Michael S Scholz, Eduardo Carrascosa, Linda Giacomozzi, Mark H Stockett, Evan J Bieske

2019-07-01

Substituted naphthalene anions (deprotonated 2-naphthol and 6-hydroxy-2-naphthoic acid) are spectroscopically probed in a tandem d..

Ultrafast photoisomerisation of an isolated retinoid.

James N Bull, Christopher W West, Cate S Anstöter, Gabriel da Silva, Evan J Bieske, Jan RR Verlet

2019-05-28

The photoinduced excited state dynamics of gas-phase trans-retinoate (deprotonated trans-retinoic acid, trans-RA-) are studied usi..

Photoinitiated Intramolecular Proton Transfer in Deprotonated para-Coumaric Acid

James N Bull, Gabriel da Silva, Michael S Scholz, Eduardo Carrascosa, Evan J Bieske

2019-05-23

Deprotonated para-coumaric acid is commonly considered as a model for the chromophore in photoactive yellow protein, which undergo..

Unveiling New Isomers and Rearrangement Routes on the C7H8 Potential Energy Surface

Ugo Jacovella, Gabriel da Silva, Evan J Bieske

2019-01-31

The unimolecular reactions of C7H8+ radical cations are among those most studied by mass spectrometry, especially the rearrangemen..

Electronic Spectra of the Triacetylene Cation (HC6H ) and Protonated Triacetylene (HC6H2 ) Tagged with Ar

Ugo Jacovella, Giel Muller, Katherine J Catani, Nastasia I Bartlett, Evan J Bieske

2019-01-01

Polyacetylene cations (HC 2n H + ) play important roles in combustion processes and in the chemistry of planetary atmospheres and ..

Ion mobility action spectroscopy of flavin dianions reveals deprotomer-dependent photochemistry

James N Bull, Eduardo Carrascosa, Linda Giacomozzi, Evan J Bieske, Mark H Stockett

2018-08-07

The intrinsic optical properties and photochemistry of flavin adenine dinucleotide (FAD) dianions are investigated using a combina..

Double Molecular Photoswitch Driven by Light and Collisions

James N Bull, Michael S Scholz, Eduardo Carrascosa, Gabriel da Silva, Evan J Bieske

2018-06-01

The shapes of many molecules can be transformed by light or heat. Here we investigate collision- and photon-induced interconversio..

Reversible Photoisomerization of the Isolated Green Fluorescent Protein Chromophore

Eduardo Carrascosa, James N Bull, Michael S Scholz, Neville JA Coughlan, Seth Olsen, Uta Wille, Evan J Bieske

2018-05-17

Fluorescent proteins have revolutionized the visualization of biological processes, prompting efforts to understand and control th..

Linkage Photoisomerization of an Isolated Ruthenium Sulfoxide Complex: Sequential versus Concerted Rearrangement

Michael S Scholz, James N Bull, Eduardo Carrascosa, Brian D Adamson, Gilbert K Kosgei, Jeffrey J Rack, Evan J Bieske

2018-05-07

Ruthenium sulfoxide complexes undergo thermally reversible linkage isomerization of sulfoxide ligands from S- to O-bound in respon..

Differential-Mobility Spectrometry of 1-Deoxysphingosine Isomers: New Insights into the Gas Phase Structures of Ionized Lipids

Berwyck LJ Poad, Alan T Maccarone, Haibo Yu, Todd W Mitchell, Essa M Saied, Christoph Arenz, Thorsten Hornemann, James N Bull, Evan J Bieske, Stephen J Blanksby

2018-04-17

Separation and structural identification of lipids remain a major challenge for contemporary lipidomics. Regioisomeric lipids diff..

Photoswitching an Isolated Donor-Acceptor Stenhouse Adduct

James N Bull, Eduardo Carrascosa, Neil Mallo, Michael S Scholz, Gabriel da Silva, Jonathon E Beves, Evan J Bieske

2018-02-01

Donor-acceptor Stenhouse adducts (DASAs) are a new class of photoswitching molecules with excellent fatigue resistance and synthet..

From E to Z and back again: reversible photoisomerisation of an isolated charge-tagged azobenzene

James N Bull, Michael S Scholz, Eduardo Carrascosa, Evan J Bieske

2018-01-07

Substituted azobenzenes serve as chromophores and actuators in a wide range of molecular photoswitches. Here, tandem ion mobility ..

Photoisomerization of Protonated Azobenzenes in the Gas Phase

Michael S Scholz, James N Bull, Neville JA Coughlan, Eduardo Carrascosa, Brian D Adamson, Evan J Bieske

2017-08-31

Because of their high photoisomerization efficiencies, azobenzenes and their functionalized derivatives are used in a broad range ..

Protomer-Specific Photochemistry Investigated Using Ion Mobility Mass Spectrometry

James N Bull, Neville JA Coughlan, Evan J Bieske

2017-08-17

The utility of tandem ion mobility mass spectrometry coupled with electronic spectroscopy to investigate protomer-specific photoch..

A strong cis-effect in an imidazole/imidazolium substituted alkene

Dayne C Georgiou, Mohammad A Haghighatbin, Conor F Hogan, Michael S Scholz, James Bull, Evan J Bieske, David JD Wilson, Jason L Dutton

2017-07-10

We report the first example of an alkene with two carbon‐bound substituents (imidazole and imidazolium rings) where the Z‐isomer h..

A Strong cis‐Effect in an Imidazole‐Imidazolium‐Substituted Alkene

Dayne C Georgiou, Mohammad A Haghighatbin, Conor F Hogan, Michael S Scholz, James N Bull, Evan J Bieske, David JD Wilson, Jason L Dutton

2017-07-10

We report the first example of an alkene with two carbon bound substituents (imidazole and imidazolium rings) where the Z-isomer h..

Online measurement of photoisomerisation efficiency in solution using ion mobility mass spectrometry

James N Bull, Eduardo Carrascosa, Michael S Scholz, Neville JA Coughlan, Evan J Bieske

2017-06-21

The photoisomerisation of charged molecules in solution is probed directly using ion mobility mass spectrometry with electrospray ..

Isomerisation of an intramolecular hydrogen-bonded photoswitch: protonated azobis(2-imidazole)

James N Bull, Michael S Scholz, Neville JA Coughlan, Evan J Bieske

2017-05-28

Photoisomerisation of protonated azobis(2-imidazole), an intramolecular hydrogen-bonded azoheteroarene photoswitch molecule, is in..

Electronic spectrum and photodissociation chemistry of the linear methyl propargyl cation H2C4H3

Katherine J Catani, Giel Muller, Gabriel da Silva, Evan J Bieske

2017-01-28

The electronic spectrum of the methyl propargyl cation (2-butyn-1-yl cation, H2C4H3+) is measured over the 230-270 nm range by pho..

Monitoring Isomerization of Molecules in Solution Using Ion Mobility Mass Spectrometry

James N Bull, Michael S Scholz, Neville JA Coughlan, Akio Kawai, Evan J Bieske

2016-12-20

An ion mobility spectrometer (IMS) with an electrospray ion source is used to investigate photo and thermal isomerization of photo..

Photo and Collision Induced Isomerization of a Cyclic Retinal Derivative: An Ion Mobility Study

Neville JA Coughlan, Michael S Scholz, Christopher S Hansen, Adam J Trevitt, Brian D Adamson, Evan J Bieske

2016-09-01

A cationic degradation product, formed in solution from retinal Schiff base (RSB), is examined in the gas phase using ion mobility..

Photoisomerization of beta-Ionone Protonated Schiff Base in the Gas Phase

Neville JA Coughlan, Claire M Wallace, Brian D Adamson, Evan J Bieske

2016-08-25

The photoisomerization of β-ionone protonated Schiff base (BIPSB) is investigated in the gas phase by irradiating mobility-selecte..