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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.

acta crystallographica. section e

Tetrakis[μ-2-(3,4-dimethoxyphenyl)acetato]-κ3O1,O1′:O1;κ3O1:O1,O1′;κ4O1:O1′-bis{[2-(3,4-dimethoxyphenyl)acetato-κ2O1,O1′](1,10-phenanthroline-κ2N,N′)erbium(III)}