Photochromism in isotopically labeled oxygen‐containing yttrium‐hydride and deuteride thin film systems

Chemoenzymatic Assembly of Isotopically Labeled Folates.

Pterin-containing natural products have diverse functions in life, but an efficient and easy scheme for their in vitro synthesis is not available. Here we report a chemoenzymatic 14-step, one-pot synthesis that can be used to generate 13C- and 15N-labeled dihydrofolates (H2F) from glucose, guanine, and p-aminobenzoyl-l-glutamic acid. This synthesis stands out from previous approaches to produce...

Synthesis of isotopically labeled saturated fatty acids.

An approach to the synthesis of isotopically labeled saturated fatty acids is outlined which is based on the copper-catalyzed coupling of an omega-bromo acid with an isotopically labeled Grignard reagent. The method provides high yields of pure products and offers considerable flexibility in the type of isotopically enriched compound that can be prepared.-DasGupta, S. K., D. M. Rice, and R. G. ...

Interrelationship of interdiffusion and microstructure in thin-film systems

Simultaneous fitting of independently measured sputter-depth profiles of intensities of Auger electrons or photoelectrons from different Auger transitions (AES) or core levels (XPS) is shown to increase the reliability of the thus determined concentration-depth profiles in diffusion-annealed thin film systems, as compared to the usually applied single profile fitting. In this context an extensi...

Activation volumes in thin film and particulate systems

Mass measurements using isotopically labeled solvents reveal the extent of solvent transport during redox in thin films on electrodes.

Thin films of nickel ferrocyanide are grown at nickel electrode surfaces by electrochemical oxidative treatment. This report describes some new microgravimetric, quartz crystal microbalance (QCM) experiments using isotopically substituted solvents which detail the transport of solvent during the redox process of the Fe sites. The results show that solvent incorporation accompanies cesium ion ex...