Showing papers by "Shawn C. Burdette published in 2013"
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TL;DR: When elements 117 and 118 are finally named, should these new members of the halogen and noble gas families receive names ending in -ium as IUPAC has suggested?
Abstract: When elements 117 and 118 are finally named, should these new members of the halogen and noble gas families receive names ending in -ium as IUPAC has suggested? Brett F. Thornton and Shawn C. Burdette look at the history of element suffixes and make the case for not following this recommendation.
14 citations
TL;DR: Using the roadmap provided by Ca(2+) predecessors, it is described how new photocaged complexes are being developed, and some of the obstacles that must be overcome to investigate an emerging area in metal ion biology with different requirements.
12 citations
TL;DR: A series of aminoazobenzene derivatives related to AzoAMP-1 have been prepared and characterized by using a variety of analytical techniques as mentioned in this paper, including photoisomerization studies and NMR spectroscopic and X-ray crystallographic investigations.
10 citations
TL;DR: Two generations of DiCast photocages that exhibit light-induced decreases in metal ion affinity have been prepared and characterized and insight into the photocage Zn(2+)-binding motifs was obtained by X-ray analysis of Di cast-2 and DiCast-3 model ligands.
Abstract: Two generations of DiCast photocages that exhibit light-induced decreases in metal ion affinity have been prepared and characterized. Expansion of the common Zn(2+) chelator of N,N-dipicolylaniline (DPA) to include additional aniline ligand provides N,N'-diphenyl-N,N'-bis(pyridin-2-ylmethyl)ethane-1,2-diamine, a tetradentate ligand that was functionalized with two photolabile groups to afford DiCast-1. Uncaging of the nitrobenzhydrol reduces the electron density on two metal-bound aniline ligands, which decreases the Zn(2+) affinity 190-fold. The analogous MonoCast photocage with a single nitrobenzhydrol group only undergoes a 14-fold reduction in affinity after an identical photochemical transformation. A second series of DiCast photocages based on a N,N'-(pyridine-2,6-diylbis(methylene))dianiline scaffold, which allows the introduction of two additional Zn(2+)-binding ligands into a preorganized chelator, expand on the multi-photolabile group strategy. DiCast-2 includes two pyridine ligands while DiCast-3 adds two carboxylate groups. Addition of bridging pyridine to the second generation photocages leads to more stable Zn(2+) complexes, and photolysis of two photolabile groups increases the Zn(2+) affinity changes to 480-fold. The Zn(2+), Cu(2+), and Cd(2+) binding properties were examined in all the DiCast photocages and the corresponding photoproducts using UV-vis spectroscopy. Further insight into the photocage Zn(2+)-binding motifs was obtained by X-ray analysis of DiCast-2 and DiCast-3 model ligands.
10 citations
TL;DR: This ratiometric fluorescent indicator is the newest technique in an ongoing effort to use emission spectroscopy to monitor Cu(II) thermodynamic activity in environmental water samples.
Abstract: Microparticles consisting of the thermal responsive polymer N-isopropyl acrylamide (polyNIPAM), a metal ion-binding ligand and a fluorophore pair that undergoes fluorescence resonance energy transfer (FRET) have been prepared and characterized. Upon the addition of Cu(II), the microparticles swell or contract depending on whether charge is introduced or neutralized on the polymer backbone. The variation in microparticle morphology is translated into changes in emission of each fluorophore in the FRET pair. By measuring the emission intensity ratio between the FRET pair upon Cu(II) addition, the concentration of metal ion in solution can be quantified. This ratiometric fluorescent indicator is the newest technique in an ongoing effort to use emission spectroscopy to monitor Cu(II) thermodynamic activity in environmental water samples.
8 citations
TL;DR: A century ago this month, Frederick Soddy described and named isotopes in the pages of Nature, and how chemists have viewed and used isotopes since then is discussed.
Abstract: A century ago this month, Frederick Soddy described and named isotopes in the pages of Nature. Brett F. Thornton and Shawn C. Burdette discuss how chemists have viewed and used isotopes since then — either as chemically identical or chemically distinct species as the need required and technology allowed.
7 citations
TL;DR: Brett F. Thornton and Shawn C. Burdette look back at the discovery — and the many different names — of element 86.
Abstract: Brett F. Thornton and Shawn C. Burdette look back at the discovery — and the many different names — of element 86.
5 citations