电感耦合等离子体光谱法测定维药阿里红中的微量元素

为建立用电感耦合等离子体光谱法测定维药阿里红中微量元素及含量的方法,用硝酸-高氯酸进行消解,电感耦合等离子体原子发射光谱法(ICP-AES)同时测定了维药阿里红样品中Al、B、Ba、Ca、Co、Cr、Li、Mg、Mn、Cu、Fe、Ni、P、Sr、Ti、V、Zn等多种微量元素。结果表明,维药阿里红中含有比较丰富的Ca、Mg元素。ICP-AES法测定简单,快速,灵敏度高,准确,其相对标准偏差为0.36%~2.52%,回收率为95.8%~101.3%,且多元素同时测定,适用于维药阿里红中微量元素的测定。     

A Highly Stable Organic Luminescent Diradical

It is very challenging to obtain stable room-temperature luminescent open-shell singlet diradicals. Herein we report the first stable Müller's hydrocarbon TTM-PhTTM with luminescent properties. Variable-temperature electron paramagnetic resonance spectroscopy measurements and theoretical calculations show that TTM-PhTTM has an open-shell singlet ground state with a diradical character of 90 %. Because of a small singlet-triplet energy gap, the open-shell singlet ground state can be thermally excited to a triplet state. TTM-PhTTM shows room-temperature deep-red emission in various solutions. Unusually high stability of TTM-PhTTM was also observed owing to effective steric hindrance and spin delocalization. Our results are beneficial to the rational design and discovery of more stable luminescent diradical materials.