Tomohiro Sato

Control of the Solid‐State Chiral Optical Properties of a Supramolecular Organic Fluorophore Containing 4‐(2‐Arylethynyl)‐Benzoic Acid

The solid-state chiral optical properties of a 4-(2-arylethynyl)-benzoic acid/amine supramolecular organic fluorophore can be controlled by changing the arylethynyl group of the achiral 4-(2-arylethynyl)-benzoic acid component molecule rather than the chirality of the amine component molecule.

Nonclassical Tunability of Solid‐State CD and CPL Properties of a Chiral 2‐Naphthalenecarboxylic Acid/Amine Supramolecular Organic Fluorophore

The solid-state chiral optical properties (circular dichroism and circularly polarized luminescence) of a 2-naphthalenecarboxylic acid/amine supramolecular organic fluorophore can be controlled by changing the aryl unit of the chiral 1-arylethylamine component of the molecule rather than altering the chirality of the 1-arylethylamine itself.

Polymorphic supramolecular organic fluorophore composed of 2-naphthalenecarboxylic acid and benzylamine

By using achiral fluorescent 2-naphthalenecarboxylic acid with achiral benzylamine, three types of polymorphic supramolecular organic fluorophores with different optical properties are created. These include a racemic supramolecular fluorophore and chiral fluorophores. These polymorphic supramolecular fluorophores can be controlled by changing the crystallization method.

Preparation of novel polymorphic pigment 3,3′-(4,4′-biphenyldiylbisthio)bis-2-methyl-1,4-naphthoquinone and its polymorphic properties

The novel pigment 3,3′-(4,4′-biphenyldiylbisthio)bis-2-methyl-1,4-naphthoquinone comprising two naphthoquinone units was successfully synthesized. This pigment exhibits three conformational polymorphs, all of which have different colors (light red, red, and deep red).

Dependence of solid-state optical properties on binding groups in biphenyl acid/amine supramolecular organic complexes

Chiral carboxylic acid/amine and sulfonic acid/amine supramolecular organic complexes composed of biphenyl units were successfully prepared using achiral biphenylcarboxylic acid (or biphenylsulfonic acid) derivatives and chiral 1-phenylethylamine as component molecules. The solid-state circular dichroism (CD) and fluorescent properties of the supramolecular complexes change significantly with the type and number of binding groups.

Solid-state fluorescence host complex formed by assembly of two-dimensional layered network structure composed of 2,6-naphthalenedicarboxylic acid and 2-naphthylethylamine

A solid-state fluorescence host complex was prepared by assembly of a two-dimensional (2D) layered hydrogen- and ionic-bonded network structure composed of 2-naphthylethylamine and 2,6-naphthalenedicarboxylic acid. In this complex, the MeOH guest molecules are one-dimensionally trapped in channel-like cavities formed by the characteristic 2D layered network structures. This supramolecular host complex including MeOH shows fluorescence in the solid state.

Molecular recognition of bisphenol A and its derivatives using p-benzoquinone

By using p-benzoquinone as an electron acceptor, charge-transfer (CT) complexes with bisphenol A and its derivatives were successfully prepared by crystallization from a solution or solid-grinding crystallization. The colors of the obtained CT complexes varied with the type of bisphenol A derivative. This CT system may be used as a sensitive and visible indicator for bisphenol A derivatives.

Molecular recognition of a large bisphenol A derivative, α,α′-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, using p-benzoquinone derivatives

Using p-benzoquinone and its derivatives as electron acceptors, charge-transfer (CT) complexes with a large bisphenol A derivative, i.e., α,α′-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, were successfully formed. The complexation behavior and color of the CT complexes varied with the crystallization method and p-benzoquinone derivative. This CT system may be applicable for sensitive and visible recovery and indication of large bisphenol A derivatives.

Control of variable composition structures by fluorine substituent in supramolecular organic fluorophore composed of 2-naphthalenecarboxylic acid

Although three types of 2-naphthalenecarboxylic acid supramolecular organic fluorophores are obtained by using benzylamine, the resulting crystal structures using fluorobenzylamine instead of benzylamine is limited, and only two types of 2-naphthalenecarboxylic acid supramolecular organic fluorophores with different optical properties are formed. In addition, the formation of these supramolecular organic fluorophores can be controlled by changing the position of the fluorine substituent or the crystallization method.

Solid-state visible molecular recognition system of bisphenol A and its derivatives by solid co-grinding crystallization with benzoquinone

Charge-transfer (CT) complexes with bisphenol A and its derivatives were successfully formed by solid co-grinding crystallization with p-benzoquinone and its derivatives as electron acceptors. The complexation behavior and color of the obtained CT complexes varied with the type of bisphenol A and p-benzoquinone derivatives that were used.