Abstract: An ink for ink jet recording contains a dye and water, a water soluble organic solvent which dissolves the dye, and 0.8 to 5 weight percent of propylene oxide/ethylene oxide block copolymer which has an average molecular weight from 1000 to 5000 and whose content of ethylene oxide group is in the range from 5 to 60 weight percent based on the average molecular weight of the block copolymer. The ink has a surface tension of 30-40 dyne/cm and a viscosity of 1-10 centipoise. An ink jet ink of this invention can be a combination of three colors, e.g., cyan, magenta and yellow, or four colors (adding black to these colors).

Abstract: An novel ink for thermal ink jet recording comprising at least water and a coloring material is provided, characterized in that there is contained an amino compound represented by the following general formula (I) or (II): ##STR1## wherein R.sub.1 represents a C.sub.1-5 alkyl group having a hydroxyl group; R.sub.2, R.sub.7 and R.sub.8 may be the same or different and each represents a hydrogen atom or a C.sub.1-5 alkyl group having a hydroxyl group; R.sub.3, R.sub.4 and R.sub.5 may be the same or different and each represents a C.sub.1-3 alkylene group; and R.sub.6 represents a C.sub.1-5 alkylene group. The content of said amino compound is in the range of 0.005 to 5.0% by weight.

Abstract: A charge transfer complex formed between a benzoquinone derivative represented by formula ##STR1## wherein at least one of the rings A and B represents a heterocyclic ring as defined in the specification, and an electron donor, and a salt of an anion or anion radical of the benzoquinone derivative of the above formula are disclosed. The charge transfer complex and the salt are useful as electronic materials.

Abstract: A thiadiazolo pyrazine compound and a method of using such a compound as an organoelectric material in a semiconductor.

Abstract: A process for separating 2,6-dimethylnaphthalene form a 2,6-dimethylnaphthalene-containing mixture which comprises mixing said mixture with 2,4,7-trinitro-9-fluorenone to thereby form a complex, separating a solid matter containing said complex and decomposing the solid matter containing the same to thereby separate and collect an oil rich in the 2,6-dimethylnaphthalene. According to this process, 2,6-dimethylnaphthalene can be readily separated at a high selectivity. Further, the 2,4,7-trinitro-9-fluorenone can be readily recovered and reused as such.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: A charge transfer complex formed between a benzoquinone derivative represented by formula ##STR1## wherein at least one of the rings A and B represents a heterocyclic ring as defined in the specification, and an electron donor, and a salt of an anion or anion radical of the benzoquinone derivative of the above formula are disclosed. The charge transfer complex and the salt are useful as electronic materials.

Abstract: A process for separating 2,6-dimethylnaphthalene from a 2,6-dimethylnaphthalene-containing mixture which comprises mixing said mixture with a complexing agent selected from the group consisting of bis(1,2,5)thiaziazolotetracyanoquinodimethane, (1,2,5)selenadiazotetrocyanonaphthoquinodimethane, (1,2,5)thiaziazolotetracyanonaphthoquinodimethane, 2,6-dichlorotetracyanoanthraquinodimethene, and 2,6-diiodotetracyanoanthraquinodimethane to thereby form a complex, separating a solid matter containing said complex; and decomposing the solid matter containing the same to thereby separate and collect an oil rich in the 2,6-dimethylnaphthalene. According to this process, 2,6-dimethylnaphthalene can be readily separated at a high selectivity. Further the complexing agent can be readily recovered and reused as such.

Abstract: The compound bis[1,2,5]thiadiazolo[3,4-b:3',4'-e]pyrazine represented by the formula (I): ##STR1## a process for preparing this compound, a method of using this compound and novel intermediate products.