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Aziridination Reactivity of a Manganese(II) Complex with a Bulky Chelating Bis(Alkoxide) Ligand.
Molecules
September 2022
Department of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA.
Treatment of Mn(N(SiMe))(THF) with bulky chelating bis(alkoxide) ligand [1,1':4',1''-terphenyl]-2,2''-diylbis(diphenylmethanol) (H[O-terphenyl-O]) formed a seesaw manganese(II) complex Mn[O-terphenyl-O](THF), characterized by structural, spectroscopic, magnetic, and analytical methods. The reactivity of Mn[O-terphenyl-O](THF) with various nitrene precursors was investigated. No reaction was observed between Mn[O-terphenyl-O](THF) and aryl azides.
View Article and Find Full Text PDFMultifunctional nanoparticles possessing magnetic, long-lived fluorescence and bio-affinity properties for time-resolved fluorescence cell imaging.
Talanta
July 2007
Department of Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
Multifunctional nanoparticles possessing magnetic, long-lived fluorescence and bio-affinity properties have been prepared by copolymerization of a conjugate of (3-aminopropyl)triethoxysilane bound to a fluorescent Eu(3+) complex, 4,4'-bis(1'',1'',1''-trifluoro- 2'',4''-butanedion-4''-yl)chlorosulfo-o-terphenyl-Eu(3+) (APS-BTBCT-Eu(3+)), free (3-aminopropyl)triethoxysilane (APS) and tetraethyl orthosilicate (TEOS) in the presence of poly(vinylpyrrolidone) (PVP) stabilized magnetic Fe(3)O(4) nanoparticles (approximately 10 nm) with aqueous ammonia in ethanol. The nanoparticles were characterized by transmission electron microscopy (TEM), spectrofluorometry and vibrating sample magnetometry methods. The direct-introduced amino groups on the nanoparticle's surface by using free APS in nanoparticle preparation facilitated the surface modification and bioconjugation of the nanoparticles.
View Article and Find Full Text PDFTwo-Gaussian excitations model for the glass transition.
J Chem Phys
July 2005
Department of Chemistry and Biochemistry, Arizona State University, Tempe, 85287-1604, USA.
We develop a modified "two-state" model with Gaussian widths for the site energies of both ground and excited states, consistent with expectations for a disordered system. The thermodynamic properties of the system are analyzed in configuration space and found to bridge the gap between simple two-state models ("logarithmic" model in configuration space) and the random energy model ("Gaussian" model in configuration space). The Kauzmann singularity given by the random energy model remains for very fragile liquids but is suppressed or eliminated for stronger liquids.
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