索烃类

It could be observed that the [2] catenanes showed absorption maxima in 438. 0nm, 463. 0nm and 517. 0nm respectively, due to the interaction between calix [4] arenocrowns and the bipyridinium ring units.

另外，通过紫外-可见光谱，研究杯[4]并冠醚[2]索烃类化合物中的电子转移情况，发现组装后生成的杯[4]芳烃[2]索烃类化合物中，由于富电子的杯[4]芳烃冠醚和缺电子的联吡啶盐之间π-π堆积相互作用依次增强，它们分别在438.0nm，463.0nm，517.0nm的位置产生新的吸收峰。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。