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The bond of the sodium ion with the sulfonate of one ligand molecule and two oxygens from the salicylic moiety of another ligand molecule gives rise to dimers in the crystal structure of [Cu2(NaHL1)(H2O)7].3.5H2O (oxygen atoms in red; sulphur in yellow; nitrogen in blue; carbon in grey and hydrogens in white; copper ions in orange; sodium ions in purple).
