Organic Electroluminescent Devices and Metal Complex Compounds

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 tridentate- or higher polydentate-chain structure ligand, and
• wherein the metal complex is a compound represented by formula (10):
• wherein MB1 represents a metal ion;
• YB1 represents a linking group;
• YB2 and YB3 each represent a lining group or a single bond;
• XB1 and XB2 each represent an oxygen atom, a sulfur atom, or a substituted or unsubstituted nitrogen atom;
• nB1 and nB2 each represent an integer of 0 to 1;
• RB1, RB2, RB3, RB4, RB5, and RB6 each represent a hydrogen atom, or a substituent;
• RB1 and RB2, and RB3 and RB4, respectively, may bond to each other to form a ring;
• LB5 represents a ligand to coordinate to MB1;
• nB3 represents an integer of 0 to 4;
• and
• YB1 does not link to RB5 or RB6.

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 tridentate- or higher polydentate-chain structure ligand, and
• wherein the metal complex is a compound represented by formula (8):
• wherein, M81 represents a metal ion;
• L81, L82, L83, and L85 each represent a ligand to coordinate to M81;
• L81 and L83 do not combine together via an atomic group, to form a cyclic ligand or a tetradentate or higher-polydentate ligand;
• L85 does not directly bond to L81 or L83, but bonds via the metal;
• Y81 and Y82 each represent a linking group, a single bond, or a double bond;
• and
• n81 represents an integer of 0 to 3.