Research Article: 4,4′-[(5-Carb­oxy-1,3-phenyl­ene)bis­(­oxy)]dibenzoic acid

Date Published: April 01, 2012

Publisher: International Union of Crystallography

Author(s): Chao Du, Wei Wu, Ge Tian.


In the title compound, C21H14O8, the central benzene ring makes dihedral angles of 77.8 (6) and 75.9 (5)° with the outer benzene rings. In the crystal, mol­ecules are linked by O—H⋯O hydrogen bonds involving carboxyl groups, forming one-dimensional ladders. Two-dimensional layers are formed by inter­penetration of these one-dimensional ladders.

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For general background, see: Moulton & Zaworotko,(2001 ▶); Kitagawa et al.,(2001 ▶); Lee et al.,(2009 ▶); Robin & Fromm, (2006 ▶). For the preparation of title compound, see: Neogi et al.(2009 ▶). For related structa­res, see: Lama et al.(2010 ▶); Pan et al. (2007 ▶).