Ultrafine particles of Prussian blue-type metal complex, dispersion liquid thereof and their production methods

The method of producing superfine particles of a Prussian-blue-structure metal complex, comprising:

• (A) mixing an aqueous solution that comprises an anionic cyano-metal-complex having a metal atom M1 as a central metal and an aqueous solution that comprises a metal cation of a metal atom M2, to precipitate crystals of a Prussian-blue-structure metal complex comprising the metal atom M1 and the metal atom M2;
• then
• (B1) mixing the crystals of the Prussian-blue-structure metal complex and a solution of a ligand L dissolved into a solvent, to obtain a dispersion liquid containing superfine particles of the Prussian-blue-structure metal complex;
• and
• (C) separating the Prussian-blue-structure metal complex from the dispersion liquid for forming the superfine particles,
• wherein the ligand L is one or more pyridine-groups.

Superfine particles of a Prussian-blue-structure metal complex, comprising:

• a crystal of a Prussian-blue-structure metal complex comprising a metal atom M1 and a metal atom M2, in which the metal atom M1 is at least one selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper;
• and the metal atom M2 is at least one selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium;
• and
• a ligand L is one kind, two kinds, or more kinds of compounds represented by formulae (1) to (3):
• wherein, in the formula, R1 and R2 each independently represent a hydrogen atom or an alkenyl group having 8 or more carbon atoms,
• wherein, in the formula, R3 represents an alkenyl group having 8 or more carbon atoms, and
• wherein, in the formula, R4 represents an alkyl group having 6 or more carbon atoms, and R5 represents an alkyl group or an alkenyl group;
• and
• wherein the ligand L is bonded to said crystal for being superfine particles in an average particle diameter of 50 nm or less.

Superfine particles of a Prussian-blue-structure metal complex, comprising:

• a crystal of a Prussian-blue-structure metal complex comprising a metal atom M1 and a metal atom M2, in which the metal atom M1 is at least one selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper;
• and the metal atom M2 is at least one selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium,
• wherein the ligand L is one or more amino-groups, and
• wherein the ligand L is bonded to said crystal for being superfine particles in an average particle diameter of 50 nm or less.

Superfine particles of a Prussian-blue-structure metal complex, comprising:

• a crystal of a Prussian-blue-structure metal complex comprising a metal atom M1 and a metal atom M2, in which the metal atom M1 is at least one selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper;
• and the metal atom M2 is at least one selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium,
• wherein the ligand L is one or more pyridine-groups, and
• wherein the ligand L is bonded to said crystal for being superfine particles in an average particle diameter of 50 nm or less.