Spatial distribution of ionic hydration energy and hyper-mobile water

George Mogami, Makoto Suzuki, Nobuyuki Matubayasi

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)


In this chapter, we provide the following two topics. 1: We carry out DRS measurements for divalent metal chloride and trivalent metal chloride solutions and clarify the hydration states. All the tested solutions have hyper-mobile water (HMW) with higher dielectric relaxation frequency f1 (~20 GHz) than that of bulk water (12.6 GHz at 10 °C), and dispersion amplitude of HMW is aligned to Hofmeister series. According to the correlation between an intensity of HMW signal and water structure entropy, HMW can be a scale for the water structure. 2: We carry out the spatial-decomposition analysis of energetics of hydration for a series of ionic solutes in combination with molecular dynamics (MD) simulation. The hydration analysis is conducted on the basis of a spatial-decomposition formula for the excess partial molar energy of the ion that expresses the thermodynamic quantity as an integral over the whole space of the ion-water and water-water interactions conditioned by the ion-water distance. In addition, we examine the correlation between the electric field formed by ion and the number of HMW around ion.

Original languageEnglish
Title of host publicationThe Role of Water in ATP Hydrolysis Energy Transduction by Protein Machinery
PublisherSpringer Singapore
Number of pages20
ISBN (Electronic)9789811084591
ISBN (Print)9789811084584
Publication statusPublished - 2018 May 7
Externally publishedYes


  • Dielectric relaxation spectroscopy
  • Hofmeister effect
  • Hyper-mobile water
  • Ionic hydration energy
  • Spatial distribution

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)


Dive into the research topics of 'Spatial distribution of ionic hydration energy and hyper-mobile water'. Together they form a unique fingerprint.

Cite this