A5045378362- Photochromic and Fluorescence Chemistry
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced NMR Techniques and Applications
- NMR spectroscopy and applications
- Supramolecular Self-Assembly in Materials
- Porphyrin and Phthalocyanine Chemistry
- Electrohydrodynamics and Fluid Dynamics
- Molecular Sensors and Ion Detection
- Hydraulic and Pneumatic Systems
- Electrical and Bioimpedance Tomography
- Photopolymerization techniques and applications
- Photoreceptor and optogenetics research
- Nanoplatforms for cancer theranostics
- Metabolomics and Mass Spectrometry Studies
- Molecular spectroscopy and chirality
- Advanced MRI Techniques and Applications
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
- Advanced Polymer Synthesis and Characterization
- Lanthanide and Transition Metal Complexes
- Nanopore and Nanochannel Transport Studies
- Spectroscopy and Quantum Chemical Studies
- Epoxy Resin Curing Processes
- Various Chemistry Research Topics
UNSW Sydney
2020-2025
Macquarie University
2020
Modifying surfaces using free radical polymerization (FRP) offers a means to incorporate the diverse physicochemical properties of vinyl polymers onto new materials. Here, we harness universal surface attachment polydopamine (PDA) "prime" range different for polymer attachment, including glass, cotton, paper, sponge, and stainless steel. We show that intrinsic species present in PDA can serve as an anchor point subsequent propagating macroradicals through radical–radical coupling. Leveraging...
A photoswitchable ligand and palladium(II) ions form a dynamic mixture of self-assembled metallosupramolecular structures. The photoswitching is an ortho-fluoroazobenzene with appended pyridyl groups. Combining the E-isomer salts affords double-walled triangle composition [Pd3 L6 ]6+ distorted tetrahedron [Pd4 L8 ]8+ (1 : 2 ratio at 298 K). Irradiation 410 nm light generates photostationary state approximately 80 % results in selective disassembly tetrahedron, more thermodynamically stable...
Abstract Polydopamine (PDA) is a synthetic model for melanin and has wide range of opto‐electronic properties that underpin its utility in applied biological settings, from broadband light absorbance to possessing stable free radical species. Here, we show PDA radicals are photo‐responsive under visible irradiation, enabling serve as photo‐redox catalyst. Steady‐state transient electron spin resonance spectroscopy reveals reversible amplification semiquinone population within light. This...
Abstract Two photoswitchable arylazopyrozoles form hydrogels at a concentration of 1.2 % (w/v). With molecular weight 258.28 g mol −1 , these are the lowest known hydrogelators that respond reversibly to light. Photoswitching E‐ Z‐form by exposure 365 nm light results in macroscopic gel→sol transition; nearly an order magnitude reduction measured elastic and loss moduli. In case meta‐arylazopyrozole, cryogenic transmission electron microscopy suggests 29±7 wide sheets E‐gel state narrow 13±2...
Azobenzene molecular switches are widely used to photocontrol material properties, and biological activity in cell culture, via photoisomerisation between E Z isomers. However, because population photoswitching is incomplete, their dynamic range of property control often small; they cannot be operated with red/NIR light, usually not applicable deep tissue. Here, we demonstrate a general method for efficient single-photon azobenzenes, glutamate receptor activity, at >700 nm live We use...
Concentration gradients of simple salts in microfluidic channels control the transport a common photo-redox catalyst.
Concentration gradients of simple salts in microfluidic channels control the transport a common photoredox catalyst.
Online, high-throughput molecular weight analysis of polymerizations is rare, with most studies relying on tedious sampling techniques and batchwise postanalysis. The ability to track both monomer conversion evolution in real time could underpin precision polymer development facilitate study rapid polymerization reactions. Here, we use a single time-resolved diffusion nuclear magnetic resonance (NMR) experiment simultaneously the kinetics during photopolymerization, situ irradiation inside...
The reported changes in self-diffusion of small molecules during reactions have been attributed to "boosted mobility". We demonstrate the critical role changing concentrations paramagnetic ions on nuclear magnetic resonance (NMR) signal intensities, which led erroneous measurements diffusion coefficients. present simple methods overcome this problem. use shuffled gradient amplitudes allows accurate NMR measurements, even with time-dependent relaxation rates caused by ions. addition a agent...
Two photoswitchable arylazopyrozoles form hydrogels at a concentration of 1.2 % (w/v). With molecular weight 258.28 g mol−1, these are the lowest known hydrogelators that respond reversibly to light. Photoswitching E- Z-form by exposure 365 nm light results in macroscopic gel→sol transition; nearly an order magnitude reduction measured elastic and loss moduli. In case meta-arylazopyrozole, cryogenic transmission electron microscopy suggests 29±7 wide sheets E-gel state narrow 13±2 upon...
The apparent “boosted mobility” observed by nuclear magnetic resonance (NMR) diffusion measurements is the result of a known artefact. When signal intensities are changing during an NMR measurement for reasons other than diffusion, use monotonically increasing gradient amplitudes produces erroneous coefficient values. We show that no boosted molecular mobility when shuffled applied.
The measured changes in self-diffusion of small molecules during reactions have been attributed “boosted mobility”. We demonstrate the critical role changing concentrations paramagnetic ions on nuclear magnetic resonance (NMR) signal intensities, which lead to erroneous measurements diffusion coefficients. present simple methods overcome this problem. use shuffled gradient amplitudes allows accurate NMR measurements, even with time-dependent relaxation rates caused by ions. addition a agent...
A photoswitchable ligand and palladium(II) ions form a dynamic mixture of self-assembled metallosupramolecular structures. The photoswitching is an ortho-fluoroazobenzene with appended pyridyl groups. E-isomer combined salts affords double-walled triangle composition [Pd3L6]6+ distorted tetrahedron [Pd4L8]8+(1:2 ratio at 298 K). Irradiation 410 nm light generates photostationary state ~80% the which results in selective disassembly tetrahedron, more thermodynamically stable structure,...
<p>A study reported in The Journal of Physical Chemistry Letters (12 (2021) 2370) “boosted mobility” measured by diffusion NMR experiments contains significant errors data analysis and interpretation. We carefully reanalyzed the same find no evidence boosted mobility, we identify several sources error.</p>
Concentration gradients of simple salts in microfluidic channels control the transport a common photo-redox catalyst.
Concentration gradients of simple salts in microfluidic channels control the transport a common photo-redox catalyst.
Abstract Polydopamine (PDA) is a synthetic model for melanin and has wide range of opto‐electronic properties that underpin its utility in applied biological settings, from broadband light absorbance to possessing stable free radical species. Here, we show PDA radicals are photo‐responsive under visible irradiation, enabling serve as photo‐redox catalyst. Steady‐state transient electron spin resonance spectroscopy reveals reversible amplification semiquinone population within light. This...
Photoswitchable arylazopyrozoles 2 and 3 form hydrogels at a concentration of 1.2% (w/v). With molecular weight 258.11 g/mol, these are the lowest known hydrogelators that respond reversibly to light. Single-crystal X-ray structures show anisotropic aggregation is driven by in-plane hydrogen bonding interactions 𝝅 - stacking. Photoswitching from E- Z-form 365 nm light results in macrocopic gel→sol transition; nearly an order magnitude reduction measured elastic loss moduli. Cryogenic...
The apparent “boosted mobility” observed by nuclear magnetic resonance (NMR) diffusion measurements is the result of a known artefact. When signal intensities are changing during an NMR measurement for reasons other than diffusion, use monotonically increasing gradient amplitudes produces erroneous coefficient values. We show that no boosted molecular mobility when shuffled applied.
A photoswitchable ligand and palladium(II) ions form a dynamic mixture of self-assembled metallosupramolecular structures. The photoswitching is an ortho-fluoroazobenzene with appended pyridyl groups. E-isomer combined salts affords double-walled triangle composition [Pd3L6]6+ distorted tetrahedron [Pd4L8]8+(1:2 ratio at 298 K). Irradiation 410 nm light generates photostationary state ~80% the which results in selective disassembly tetrahedron, more thermodynamically stable structure,...
ADVERTISEMENT RETURN TO ISSUEPREVLetter to the EditorNEXTComment on "Molecules, Ultimate Nanomotor: Linking Chemical Reaction Intermediates their Molecular Diffusivity"Jan-Philipp Günther*Jan-Philipp GüntherMax Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany*Email: [email protected]More by Jan-Philipp Güntherhttps://orcid.org/0000-0002-8083-0658, Lucy L. FillbrookLucy FillbrookSchool of Chemistry, UNSW Sydney, NSW 2052, AustraliaMore...
A study reported in The Journal of Physical Chemistry Letters (12 (2021) 2370) “boosted mobility” measured by diffusion NMR experiments contains significant errors data analysis and interpretation. We carefully reanalyzed the same find no evidence boosted mobility, we identify several sources error.