The triplet excited state of the biocative compound thiabendazole. Characterization and suitability as reporter for cyclodextrin complexation

Fluorescence spectroscopy, laser flash photolysis (LPF), and density functional theory calculations have been performed to characterize the photobehavior of thiabendazole (1). Direct LFP of 1 results in the generation of a transient absorbing at λmax = 570 nm identified as the triplet excited state (31∗). The intersystem crossing quantum yield is 0.91, and the triplet energy is 288 kJ mol−1. The singlet–triplet energy gap is 84 kJ mol−1. The behavior of thiabendazole within CDs results in a marked enhancement of the triplet lifetime, this change is attributed to the mobility restrictions of included 1 imposed by the cyclodextrin cavities.Financial support from the MICINN (Grants: CTQ2009-11027/BQU, CTQ2010-19909 and pre-doctoral fellowship to P.B.) and the Generalitat Valenciana (Prometeo Program) is gratefully acknowledged.Bartovsky, P.; Domingo, LR.; Jornet Olivé, MD.; Miranda Alonso, MÁ.; Tormos Faus, RE. (2012). The triplet excited state of the biocative compound thiabendazole. Characterization and suitability as reporter for cyclodextrin complexation. Chemical Physics Letters. 525-526:166-170. https://doi.org/10.1016/j.cplett.2012.01.001S166170525-52

Hidden Voices of Black Men

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66982/2/10.1177_002193479402500102.pd

Characters and Environments

The concepts of reaction norms and phenotypic plasticity help us better understand what a biological trait is

Crystal Structure Dependence of Antiferromagnetic Coupling in FE/SI Multilayers

Recent reports of temperature dependent antiferromagnetic coupling in Fe/Si multilayers have motivated the generalization of models describing magnetic coupling in metal/metal multilayers to metal/insulator and metal/semiconductor layered systems. Interesting dependence of the magnetic properties on layer thickness and temperature are predicted. We report measurements that show the antiferromagnetic (AF) coupling observed in Fe/Si multilayers is strongly dependent on the crystalline coherence of the silicide interlayer. Electron diffraction images show the silicide interlayer has a CsCl structure. It is not clear at this time whether the interlayer is a poor metallic conductor or a semiconductor so the relevance of generalized coupling theories is unclear