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The asymmetric unit of the binuclear centrosymmetric title compound, [Er 2 (C 12 H 14 O 4 ) 2 (C 12 H 15 O 4 ) 2 (C 12 H 8 N 2 ) 2 (H 2 O) 2 ]·2H 2 O, contains one Er III  atom, one coordinated water mol­ecule, one 1,10-phenanthroline (phen) ligand, two differently coordinated adamantane-1,3-dicarboxyl­ate ( H 2 L ) ligands and one lattice water mol­ecule. The Er III  ion is eight-coordinated by four O atoms from bridging  L2− , one O atom from H L− , one O atom from the coordinated water and two N atoms from a phen ligand. Extensive O—H⋯O hydrogen-bonding inter­actions result in the formation of chains which are further linked into a layer-like network by π–π stacking inter­actions centroid–centroid distance = 3.611 (3) Å] between adjacent phen ligands belonging to neighbouring chains. The carboxy group of the H L−  ligand is equally disordered over two positions.

acta crystallographica. section e

Bis(μ-adamantane-1,3-dicarboxylato-κ4O1,O1′:O3,O3′)bis[aqua(3-carboxyadamantane-1-carboxylato-κO1)(1,10-phenanthroline-κ2N,N′)erbium(III)] dihydrate