Tetra­kis[μ-2-(3,4-dimeth­oxy­phen­yl)acetato]-κ(3) O (1),O (1′):O (1);κ(3) O (1):O (1),O (1′);κ(4) O (1):O (1′)-bis­{[2-(3,4-dimeth­oxy­phen­yl)acetato-κ(2) O (1),O (1′)](1,10-phenanthroline-κ(2) N,N′)erbium(III)}

In the dimeric centrosymmetric title complex, [Er(2)(C(10)H(11)O(4))(6)(C(12)H(8)N(2))(2)], the Er(III) ion is nine-coordinated by five 2-(3,4-dimeth­oxy­lphen­yl)acetic acid (DMPA) ligands via seven O atoms and two N atoms from a bis-chelating 1,10-phenanthroline (phen) ligand in a distorted tricapped trigonal-prismatic geometry. The DMPA ligands are coordinated to the Er(III) ion in bis-chelate, bridging and bridging tridentate modes. Relatively weak intra­molecular C—H⋯O inter­actions reinforce the stability of the mol­ecular structure. Inter­molecular C—H⋯O inter­actions are also observed.