Compounds have a formula (1) wherein Y and Z are independently O, N, P; R, R.sup.1, R.sup.2, R.sup.3, where present, are independently H. Optionally substituted C.sub.1-C.sub.12 alkyl, O, or R and R.sup.1 and/or R.sup.2 and R.sup.3 form, together with the atom Y and/or Z to which they are attached, a 3-14 membered ring. The compounds optionally contain one or more additional heteroatoms selected from O, N, and S, optionally substituted. Compositions include such compounds and the medical uses utilize such compounds.

An optically transparent matrix including a molecule containing a hydroxyazobenzene group or its derivative embedded in the matrix. An optical system including the optically transparent matrix, an isomerizing light source, and one or more light detector(s) for measuring absorbance changes from the optically transparent matrix. A method for measuring the quantity of hydrogen bonding gaseous molecules.

An optically transparent matrix including a molecule containing a hydroxyazobenzene group or its derivative embedded in the matrix. An optical system including the optically transparent matrix, an isomerizing light source, and one or more light detector(s) for measuring absorbance changes from the optically transparent matrix. A method for measuring the quantity of hydrogen bonding gaseous molecules.

Provided is a compound represented by formula (1). In formula (1), Ar.sup.1, Ar.sup.2, and Ar.sup.3 represent a 1,4-phenylene group or a divalent sulfur-containing aromatic heterocyclic group optionally having a substituent, and at least one of Ar.sup.1 and Ar.sup.2 has a fluorine atom as a substituent; n represents 1 or 2; R.sup.1 represents a single bond or a group selected from the group consisting of —OC(═O)—, —C(═O)O—, —C≡C—, —CH═CH—, —CH═N—, and —N═CH—; R.sup.2 represents an alkylamino group or an alkoxy group; R.sup.3 represents a group selected from the group consisting of an alkanediyl group, an alkanediyloxy group, an alkanediyloxycarbonyl group, and an alkanediylcarbonyloxy group; and R.sup.4 represents a polymerizable group or a hydrogen atom.

R.sup.4—R.sup.3-Ar.sup.1-(-R.sup.1-Ar.sup.2-).sub.n-N═N-Ar.sup.3-R.sup.2  (1)

Provided is a compound represented by formula (1). In formula (1), Ar.sup.1, Ar.sup.2, and Ar.sup.3 represent a 1,4-phenylene group or a divalent sulfur-containing aromatic heterocyclic group optionally having a substituent, and at least one of Ar.sup.1 and Ar.sup.2 has a fluorine atom as a substituent; n represents 1 or 2; R.sup.1 represents a single bond or a group selected from the group consisting of —OC(═O)—, —C(═O)O—, —C≡C—, —CH═CH—, —CH═N—, and —N═CH—; R.sup.2 represents an alkylamino group or an alkoxy group; R.sup.3 represents a group selected from the group consisting of an alkanediyl group, an alkanediyloxy group, an alkanediyloxycarbonyl group, and an alkanediylcarbonyloxy group; and R.sup.4 represents a polymerizable group or a hydrogen atom.

R.sup.4—R.sup.3-Ar.sup.1-(-R.sup.1-Ar.sup.2-).sub.n-N═N-Ar.sup.3-R.sup.2  (1)

The present disclosure provides a quantum dot ligand and a method for preparing the same, a light emitting device and a method for preparing the same, and a display device. The quantum dot ligand is an azobenzene compound represented by formula (I). The azobenzene compound in the quantum dot ligand of the present disclosure has at least one group on each benzene ring, and the groups on the benzene rings of the azobenzene compound can be connected to the quantum dot through a coordination bond, thereby forming a network or chain structure.

The present invention relates to the sector of self-diagnostic composite materials. In particular, the invention presents an agent, which can be cross-linked together with a curing agent in a matrix, e.g. an epoxy resin, and fibres, e.g., carbon fibre, in order to obtain a composite material containing a reporting probe capable of detecting stress, fatigue and microscopic cracks in the material with high spatial resolution and sensitivity.

The present invention relates to the sector of self-diagnostic composite materials. In particular, the invention presents an agent, which can be cross-linked together with a curing agent in a matrix, e.g. an epoxy resin, and fibres, e.g., carbon fibre, in order to obtain a composite material containing a reporting probe capable of detecting stress, fatigue and microscopic cracks in the material with high spatial resolution and sensitivity.

A fiber having a polymer sheath and a core. The core has a liquid crystal and a compound capable of photoisomerization, such as that shown below. A method of: providing a first solution of a polymer, providing a second solution of a liquid crystal and compound capable of photoisomerization, and electrospinning the first solution and the second solution to form the fiber.

##STR00001##

A compound that is fluidized by light irradiation and reversibly non-fluidized and is represented by the following general formula (1):

##STR00001##

In the general formula (1), Ar.sub.1 and Ar.sub.2 each independently represent an aromatic hydrocarbon group optionally having a substituent or an aromatic heterocyclic group optionally having a substituent, and Y, Z.sub.1, and Z.sub.2 each independently represent a hydrogen atom or a lower alkyl group.