Crystal structures of the potassium and rubidium salts of (3,5-di-chloro-phen-oxy)acetic acid: two isotypic coordination polymers.

ABSTRACT: The two-dimensional coordination polymeric structures of the hydrated potassium and rubidium salts of (3,5-di-chloro-phen-oxy)acetic acid (3,5-D), namely, poly[?-aqua-bis-[?3-2-(3,5-di-chloro-phen-oxy)acetato]-dipotassium], [K2(C8H5Cl2O3)2(H2O)] n , and poly[?-aqua-bis-[?3-2-(3,5-di-chloro-phen-oxy)acetato]-dirubidium], [Rb2(C8H5Cl2O3)2(H2O)] n , respectively, have been determined and are described. The two compounds are isotypic and the polymeric structure is based on centrosymmetric dinuclear bridged complex units. The irregular six-coordination about the alkali cations comprises a bridging water mol-ecule lying on a twofold rotation axis, the phen-oxy O-atom donor and a triple bridging carboxyl-ate O atom of the oxo-acetate side chain of the 3,5-D ligand, and the second carb-oxy-ate O-atom donor also bridging. The K-O and Rb-O bond-length ranges are 2.7238?(15)-2.9459?(14) and 2.832?(2)-3.050?(2)?Å, respectively, and the K?K and Rb?Rb separations in the dinuclear units are 4.0214?(7) and 4.1289?(6)?Å, respectively. Within the layers which lie parallel to (100), the coordinating water mol-ecule forms an O-H?O hydrogen bond to the single bridging carboxyl-ate O atom.

SUBMITTER: Smith G 

PROVIDER: S-EPMC4647356 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature