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Abstract: The time-dependent survival probability for photoelectrons produced following resonant excitation of I- in its first charge-transfer-to-solvent (CTTS) band is determined by femtosecond pump–probe spectroscopy. The solvent effect on localization and recombination dynamics of the detached solvated electrons in various hydroxylic solvents (H2O, CH3OH, C2H5OH, C3H7OH, C4H9OH) is studied. The data are consistent with a caged geminate pair being formed in the CTTS photodetachment step. In all solvents, the geminate recombination of the detached electron can be modeled as competition between diffusive escape from an attractive short-range potential (∼3kBT) and reverse electron transfer to reform ground state iodide. [Copyright &y& Elsevier]

Layered metal phosphonate, zinc phenylphosphonate (PPZn) was synthesized and used as a model benign nucleating agent for poly(butylene adipate) (PBA) to manipulate the crystallization behavior, polymorphic crystalline structure and biodegradation of PBA. Upon incorporation of PPZn, the crystallization temperature ( T c ) and crystallinity of PBA increased. Meanwhile, the crystallization rate and spherulite density of PBA increased in the presence of PPZn, indicating that PPZn has an effective nucleating effect for PBA. PPZn is favorable for the formation of the PBA α -modification. Furthermore, PPZn would speed up highly the phase transition of PBA from the β - to α -one. PPZn significantly suppressed the biodegradation of PBA. Mechanisms for nucleating, preferential formation of the α -modification, accelerated phase transition and decreased degradation rate of PBA in the presence of PPZn have also been proposed. It is considered that layered metal phosphonate material is a new type of benign filler for controlling the polymorphic crystalline structure and biodegradation rate of the polymer, which is expected to further modify the property of the polymer and might widen the applications of biodegradable materials in the environmental and biomedical fields. [ABSTRACT FROM AUTHOR]