Extended covalent solid forms of carbon dioxide with carbon-oxygen single bonds

Recent evidence points toward the existence at high pressures of extended c ovalent solid forms of carbon dioxide with carbon-oxygen single bonds. A (C O2)(2n + 1) polyspirotrioxane (polyspiro orthocarbonate) polymer structure proposed by us in 1992 and predicted as thermodynamically feasible and synt hesizable under high pressure is consistent with the recent experimental fi ndings. (C) 2000 Elsevier Science B.V. All rights reserved.