Molecular Technology, Volume 4 by Yamamoto Hisashi;Kato Takashi; & Takashi Kato

Author:Yamamoto, Hisashi;Kato, Takashi; & Takashi Kato [Yamamoto, Hisashi & Kato, Takashi]
Language: eng
Format: epub
ISBN: 9783527820436
Publisher: John Wiley & Sons, Inc.
Published: 2019-02-12T13:25:53+00:00

8

Coordination Molecular Technology

Nobuto Yoshinari and Takumi Konno

Osaka University, Graduate School of Science, Department of Chemistry, Osaka, 560‐0043, Japan

8.1 Introduction: Coordination Molecular Technology

Metal atoms/ions act as a Lewis acid by accepting electron pairs from ligands, such as organic molecules and inorganic anions, to form coordination compounds, that is, metal complexes. Metallic elements occupy about 80% in the periodic table, and organic and inorganic ligands are generally composed of the remaining 20% nonmetallic elements. Thus, coordination chemistry has a feature of the chemistry covering all elements. Structural diversity is one of the most attractive features of coordination compounds. Thanks to the recent development of synthetic techniques in coordination chemistry, highly complicated structures, such as “heterometallic complexes” with more than one kind of metal ions and “heteroleptic complexes” with more than one kind of ligands [1], have been rationally constructed [2–6]. Moreover, the introduction of supramolecular interaction sites, such as hydrogen bonding and π donors/acceptors, in a molecule enables control of the spatial arrangement of complex molecules or ions in a crystal packing structure. Such a technique is called “crystal engineering,” which is important to the practical application of solid‐state materials [7,8]. Despite the development of synthetic coordination chemistry, control of the spatial arrangement of complex ions in an ionic solid still remains challenging. This is because of the presence of a very strong Coulombic force between cations and anions, which commonly determines their spatial arrangements. However, such a limit of “crystal engineering” in ionic solids has recently been overcome via a new molecular technology based on coordination chemistry. We refer to this technology as “Coordination Molecular Technology,” which leads to the creation of new conceptual ionic solids having a novel view of materials, i.e. non‐Coulombic ionic solids (NCISs). The most important factors of this technology are the (i) size enlargement and (ii) surface functionalization of ionic coordination compounds.

In this chapter, we wish to describe several examples of NCISs constructed by coordination molecular technology, in comparison with related functional materials.

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