Komplexe mit aromatischen Carbonsäuren. V. Über die Schichtstruktur von Cd[C6H4(COO)2] · H2O

Complexes with Aromatic Carboxylic Acids. V. On the Layer Structure of CdC₆H₄(COO)₂] · H₂O Single crystals of CdC₆H₄(COO)₂] · H₂O were grown in aqueous silica gel. According to differential thermal analysis the dehydration commences at 160°C, and decomposition to CdO occurs between 380 and 420°C. Cd²⁺ is surrounded by one water molecule and six oxygen atoms stemming from carboxylate groups (Cd? O: 225.4–247.0 pm). One carboxylate group chelates Cd²⁺. Two carboxylate oxygen atoms are bound to two Cd²⁺ each. The coordination polyhedra are interlinked by a common edge and two common corners. Further connection is established by the phthalate dianions. This leads to layers parallel (010). The COO^? groups are titled differently against the plane of the C₆ ring (40° and 71°). The C? O bond lengths reach from 125.9 to 128.3 pm, the C? C bonds of the C₆ ring from 136.7 to 140.3 pm.