Organic electroluminescent devices and metal complex compounds

1. An organic electroluminescent device, comprising: a pair of electrodes and at least one organic layer including a luminescent layer between the pair of electrodes, wherein at least one layer between the pair of electrodes comprises at least one metal complex having a polydentate-chain structure ligand, and wherein the metal complex is a compound represented by formula (2):

wherein, M 21 represents a metal ion; Y 21 , Y 22 and Y 23 each represent a single bond; Q 21 and Q 22 each represent an atomic group necessary to form a nitrogen-containing heterocycle, wherein the nitrogen-containing heterocycle is an unsubstituted pyridine; X 21 and X 22 each represent an oxygen atom, a sulfur atom, or a substituted or unsubstituted nitrogen atom; R 21 , R 22 , R 23 and R 24 each represent a hydrogen atom, an alkyl group, an aryl group, or a group that forms condensed rings by forming bonds between R 21 and R 22 , or between R 23 and R 24 ; L 25 represents a ligand to coordinate to M 21 ; and n 21 represents an integer of 0 to 4.

2. The organic electroluminescent device of claim 1 , wherein the metal complex is selected from the group consisting of compounds 21, 22, 23 and 151 below:

3. An organic electroluminescent device, comprising: a pair of electrodes and at least one organic layer including a luminescent layer between the pair of electrodes, wherein at least one layer between the pair of electrodes comprises at least one metal complex having a polydentate-chain structure ligand, and wherein the metal complex is a compound represented by formula (2):

wherein, M 21 represents a metal ion; Y 21 represents a linking group, or a single bond; Y 22 and Y 23 each represent a single bond or a linking group; Q 21 and Q 22 each represent an atomic group necessary to form a nitrogen-containing heterocycle, wherein the nitrogen-containing heterocycle is an unsubstituted pyridine; a bond between Y 21 and the ring formed with Q 21 , and a bond between Y 21 and the ring formed with Q 22 each represent a single bond; X 21 and X 22 each represent an oxygen atom, a sulfur atom, or a substituted or unsubstituted nitrogen atom; R 21 , R 22 , R 23 and R 24 each represent a hydrogen atom, an alkyl group, or an aryl group; L 25 represents a ligand to coordinate to M 21 ; and n 21 represents an integer of 0 to 4.

4. The organic electroluminescent device of claim 3 , wherein the metal complex is a compound represented by formula (2) in which Y 21 represents a linking group composed of at least one atom.

5. The organic electroluminescent device of claim 3 , wherein the metal complex is a compound represented by formula (2) in which Y 21 represents a single bond.

6. The organic electroluminescent device of claim 3 , wherein the metal complex is a compound represented by formula (2) in which Y 21 is selected from the group consisting of: a single bond, a thiocarbonyl linking group, an alkylene group, an alkenylene group, an arylene group, a heteroarylene group, an oxygen-atom linking group, a nitrogen atom-linking group, a silicon atom-linking group, a linking group comprising a combination of these groups.

7. The organic electroluminescent device of claim 3 , wherein the metal complex is a compound represented by formula (2) in which Y 21 is selected from the group consisting of: a phenylene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring or an alkylene group.