halogens

pyridine can react with halogens, nitronium fluoroborate, sulfur trioxide, boranes and chromium trioxide to form some useful organic reagents which are introduced briefly in the paper.

吡啶可以和卤素、硝基四氟化硼盐、三氧化硫、硼烷及三氧化铬反应，形成一些有用的有机试剂。

Contrary to electron-withdrawing groups, electron-donating groups in the phenyls of the compounds increase the fluorescence intensities, and decrease with atomic weight of halogens.

结果表明，卟啉化合物的苯基上供电子取代基能增加卟啉的荧光强度，而吸电子取代基作用相反；荧光强度随着卟啉的苯环上取代基卤素原子量的增加而降低；

F, Cl, Br and I are enriched in the upper wall rocks of buried orebodies, showing that the halogens can be used as indicator elements of buried ores such as the Wanshan Hg deposit.

在隐伏矿体上部围岩中，F、Cl、Br、I都有异常显示，这种卤素元素异常对寻找隐伏矿体具有指示意义。