synthesis and structural characterization of the sodium salt of a new sulfonate-containing water soluble n-donor ligand？ self-assembly in the solid state by π？π stacking interactions钠盐的合成和结构表征一个新的sulfonate-containing水溶性n-donor配体自组装在固态ππ堆积相互作用.pdf

Molecules 2006, 11, 163-168 molecules ISSN 1420-3049 Full Paper Synthesis and Structural Characterization of the Sodium Salt of a New Sulfonate-containing Water Soluble N-Donor Ligand ⎯ Self-assembly in the Solid State by π−π Stacking Interactions * Yonglian Zhang and Hong-Chang Liang Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182, USA; Fax: +1 (619) 594-4634; Tel: +1 (619) 594-6215. Home page URL: /faculty/Liang/ * Author to whom correspondence should be addressed; e-mail: hcliang@ Received: 1 September 2005; in revised form: 14 February 2006 / Accepted: 14 February 2006 / Published: Abstract : The synthesis, spectroscopic characterization, and X-ray crystal structure of the sodium salt of a new sulfonated water-soluble ligand, sodium 2-(2-pyridin-2-yl- ethylamino)-benzenesulfonate (L) are described. Compound L crystallizes in the centrosymmetric space group Pbcn, orthorhombic, a=31.930(13) Å, b=7.153(3) Å, c=14.193(6) Å, α=90.00, β=90.00, γ=90.00, V=3220(2) Å3, Z=9. π−π stacking contacts involving interactions between the π-donor benzene and the π-acceptor pyridine systems reinforce and direct the self-assembly of the structural motifs in the solid state. Keywords: Sulfonate, Water-soluble Ligand, π−π Stacking, Michael-type Addition. Introduction Water-soluble ligands and the corresponding derived catalysts are of great interest for aqueous catalysis. Typically there are many mor