Abstract
Four new magnesium containing metal–organic hybrid compounds have been synthesized in an effort to prepare low-density materials for hydrogen storage. The compounds were prepared hydrothermally and characterized using single crystal X-ray diffraction. Three of these compounds are analogs of known transition metal structures with squarate ( I, Pn-3 n, a = 16.276(5) Å), diglycolate ( II, P2 12 12 1, a = 6.860(1) Å, b = 9.993(1) Å, c = 10.884(1) Å, R 1 = 0.0341), and glutarate ( III, R-3, a = 10.744(2) Å, c = 28.677(5) Å, R 1 = 0.0554) ligands; the fourth is a novel structure using cyclobutanetetracarboxylate ( IV, Pccn, a = 9.382(1) Å, b = 14.410(2) Å, c = 8.725(1) Å, R 1 = 0.0465) which contains potassium as well as magnesium cations.
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