加納 博文

Materials that can undergo structural or phase transformations have attracted considerable attention as functional materials in many fields for electric, magnetic, optical, adsorption, separation, or catalysis applications. Outstanding examples of structure-switchable or phase-changeable metal complexes with fluorinated anions have been reported. This review focuses on recent advances in the literature on coordination polymers and metal complexes with fluorinated anions. For representative examples, the physical/chemical properties (crystal-to-crystal, crystal-to-plastic crystal, and crystal-to-liquid phase changes, guest accommodation/removal, magnetic properties, etc.) induced by external stimuli such as temperature/pressure changes are discussed, with comparisons to the properties of coordination polymers/metal complexes with nonfluorinated anions. In addition, ELM-11 (ELM = elastic layer-structured metal–organic framework) with fluorinated BF4 anions, which is the first discovered structure-switchable, crystalline coordination polymer with fluorinated anions showing gate adsorption/desorption properties, is examined. The coordination states of fluorinated anions in coordination polymers/metal complexes, together with the adsorption/separation properties, are also considered. These insights can aid in understanding the roles and features of fluorinated anions in such materials.

Iodine is one of the essential elements for human nutrition. Iodine measurement in biological samples is carried out almost exclusively by one of two methods: One is a kinetic spectrophotometric method called the Sandell-Kolthoff reaction based on the reduction of yellow Ce(IV) by As(III) to colorless Ce(III), which is normally very slow. Consequently, other methods, for example, inductively coupled plasma mass spectrometry (ICP-MS), are used. This chapter presents the detailed descriptions for these analytical methods. Ion-selective electrodes (ISEs) are commercially available for iodide and have been applied for the determination of iodide. Local structural information such as interatomic distances, coordination numbers, and Debye-Waller parameters, which are complementary to the vibration frequencies obtained by infrared (IR) and Raman spectroscopy, can be obtained by analyzing the extended X-ray absorption fine structure (EXAFS) part of the X-ray absorption spectra.