Crystal engineering with short-chained amphiphiles: deca-sodium octa-n-butane-sulfonate di-?-chlorido-bis-[di-chlorido-palladate(II)] tetra-hydrate, a layered inorganic-organic hybrid material.

ABSTRACT: In the course of crystal-engineering experiments, crystals of the hydrated title salt, Na10[Pd2Cl6](C4H9SO3)8·4H2O, were obtained from a water/2-propanol solution of sodium n-butane-sulfonate and sodium tetra-chlorido-palladate(II). In the crystal, sodium n-butane-sulfonate anions and water mol-ecules are arranged in an amphiphilic inverse bilayered cationic array represented by the formula {[Na10(C4H9SO3)8(H2O)4]2+} n . Within this lamellar array: (i) a hydro-philic layer region parallel to the bc plane is established by the Na+ cations, the H2O mol-ecules (as aqua ligands in ?Na,?Na'-bridging coordination mode) and the O3S- groups of the sulfonate ions, and (ii) hydro-phobic regions are present containing all the n-butyl groups in an almost parallel orientation, with the chain direction approximately perpendicular to the aforementioned hydro-philic layer. Unexpectedly, the flat centrosymmetric [Pd2Cl6]2- anion in the structure is placed between the butyl groups, within the hydro-phobic regions, but due to its appropriate length primarily bonded to the hydro-philic 'inorganic' layer regions above and below the hydro-phobic area via Pd-Clt?Na- and Pd-Clt?H-O(H)-Na-type (Clt is terminal chloride) inter-actions. In addition to these hydrogen-bonding inter-actions, both aqua ligands are engaged in charge-supported S-O?H-O hydrogen bonds of a motif characterized by the D 4 3(9) graph-set descriptor within the hydro-philic region. The crystal structure of the title compound is the first reported for a metal n-butane-sulfonate.

SUBMITTER: Thoelen F 

PROVIDER: S-EPMC6505587 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature