Synthesis and molecular structure of new O/N/O ligands: Bis-phenol-pyridine and bis-phenol-pyrazole
作者:Artur M.S. Silva、Lúcia M.P.M. Almeida、JoséA.S. Cavaleiro、Concepción Foces-Foces、Antonio L. Llamas-Saiz、Christophe Fontenas、Nadine Jagerovic、José Elguero
DOI:10.1016/s0040-4020(97)00733-3
日期:1997.8
nitrogen of the pyridine to overcome electronic repulsion. In salt 3, intramolecular hydrogen bonds are found between the pyridinium proton and the hydroxyl atoms which are involved in strong OH…O and OH…F interactions. In addition, the water molecule participates in a bridging hydrogen bond network with the BF4−. The molecules in 4, are also held together by hydrogen bonds where the hydroxyl groups
制备了两个新的杂环配体2,6-双-(2'-羟基苯基)吡啶2和3,5-双-(2'-羟基苯基)吡唑4。的分子结构的2,6-双- (2'-甲氧基苯基)吡啶1,的四氟硼酸盐的2,6-双- (2'-羟苯基)吡啶3(一水合物)和该化合物的4已被确定X射线分析。在图1中,苯环的取向使得甲氧基的氧原子远离吡啶的氮放置以克服电子排斥。盐3在吡啶鎓质子和与强O atomsH…O和O bondsH…F相互作用密切相关的羟基原子之间发现了分子内氢键。此外,水分子参与了桥接氢键网络与BF 4 - 。4中的分子也通过氢键保持在一起,其中羟基既充当供体又充当受体,并负责链的形成。