heterocyclic ring

A chemical compound in the form of a heterocyclic ring, containing a metal ion attached by coordinate bonds to at least two nonmetal ions.

杂环化学复合物，由一个金属离子与两个或两个以上非金属离子构成配位键。

Oxazoline, a five-membered heterocyclic ring containing both N and O coordinated atoms, is an excellent class among nitrogen-containing chiral ligands.

其中，同时含有N和O的五元杂环的恶唑啉配体是比较优秀的一类含氮手性配体。

Syntheses and Properties of Rare Earth Elements with Tiron and Nitrogen Heterocyclic Ring

稀土与钛铁试剂，含氮杂环三元配合物的制备和性质

In EIMS there are many frame-rearrangement ion peaks. The cleavage of C-O, C-F. C-CF3 bonds and the formation of five-or four-membered heterocyclic ring ions containing nitrogen by losing CO are major mass spectrometric characters.

在EIMS中，均存在较多的骨架重排离子峰，其中C O，C F，C CF3，键断裂及失去CO形成的五元，四元含氮杂环离子是重要质谱特征。

Azole: a class of organic compounds having a five-membered heterocyclic ring with two double bonds.

氮杂茂: 一种由五种杂环元素,两组粘合剂组成的有机化合物.