Abstract
Abstract BaC4O4-3H2O was prepared by crystallization in aqueous silica gel. The crystal structure is a complicated three-dimensional framework. Ba2+ has CN 8+1. It is surrounded by 5 water molecules and 4 Osquarate atoms (Ba-O distances from 271.1 to 324.2 pm). The squarate dianion is almost planar and shows C -C and C-O bond lengths indicating the existence of resonance stabilization, although one Osquarate atom is not connected to Ba2+ at all. Short water-Osquarate distances hint to strong hydrogen bonding which obviously plays an important part in this structure.
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