| | 1 | Author
| Christian Robl | Requires cookie* | | | Title
| Komplexe mit aromatischen Carbonsäuren, IV [1] Ca 2 [C 6 H 2 (COO) 4 ] * 6 H 2 0 -Eine neue Schichtstruktur Complexes with Aromatic Carboxylic Acids, IV [1] Ca 2 [C 6 H 2 (C00) 4 ]-6H 2 0 -A Novel Layer Structure  | | | | Abstract
| Single crystals of Ca 2 [C 6 H 2 (COO) 4 ]-6H 2 0 were grown in aqueous silica gel. Ca :+ hasCN 6+2. The coordination polyhedron is formed by three water molecules and five oxygen atoms of carboxylate groups. Six oxygen atoms are closely bound (235,9—243,9 pm), the two remaining coordination partners are considerably more remote from Ca 2+ (268,2 and 273,8 pm). COO" groups chelate Ca :+ in an asymmetric manner, but the C —O bond lengths do not differ markedly (125,2—126,3 pm). The connection of Ca 2+ with [C,H 2 (COO) 4 ] 4_ leads to rigid layers. Adjacent layers are interlinked by hydrogen bonds. Those oxygen atoms which are weakly bound to Ca 2+ are favoured as proton acceptors in hydrogen bonds. The COO groups are tilted differently against the C 6 -ring plane. One is approximately coplanar, but the other is oriented almost perpen-dicularly. | | | |
Reference
| Z. Naturforsch. 43b, 993—997 (1988); eingegangen am 11. April 1988 | | | |
Published
| 1988 | | | |
Keywords
| Pyromellitate, Layer Structure, Preparation, Hydrogen Bonding | | | |
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| default:Reihe_B/43/ZNB-1988-43b-0993.pdf | | | | Identifier
| ZNB-1988-43b-0993 | | | | Volume
| 43 | |
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