Two palladium-containing silicates are prepared through sol-gel, and doping of L-sodium lactate plays a key role for giving helical morphology. The helical silicate is modified by chiral sulfonyl chloride in order to modulate coordination environment of palladium for enhanced catalysis. The porosity, composition, crystalline nature and bulk chirality have been studied too. All synthetic silicates show high yields for nitration of arenes by using available nitro-source. Both solvent acidity and oxidant seem crucial to nitration more than others. The conversion of larger arene is related to catalyst porosity, and modification of silicate with chiral sulfonyl chloride shows varied results. Furthermore, two catalysts exhibit renewable recycling behaviors, proving their interior palladium could be utilized. Lastly, a tetravalent palladium-facilitated mechanism is proposed. This wok may contribute to the design and catalytic application of nanosized or microsized silica material with particular morphology.

通过溶胶-凝胶制备了两种含钯的硅酸盐，L-乳酸钠的掺杂在提供螺旋形貌方面起着关键作用。螺旋硅酸盐被手性磺酰氯改性，以调节钯的配位环境以增强催化作用。还研究了孔隙率，组成，结晶性质和本体手性。通过使用可用的硝基源，所有合成的硅酸盐都显示出芳烃硝化的高收率。溶剂酸度和氧化剂对硝化作用似乎比其他因素更为重要。较大的芳烃的转化率与催化剂的孔隙率有关，用手性磺酰氯改性硅酸盐显示出不同的结果。此外，两种催化剂表现出可再生的循环行为，证明其内部钯可被利用。最后，提出了四价钯促进机理。该炒锅可有助于具有特定形态的纳米级或微米级二氧化硅材料的设计和催化应用。