The attachment of a group to a central metallic agent such as iron with two valences to form a heterocyclicring.
一种基与中心金属离子(如二价铁离子)结合，形成杂环。
2
Structute of nitrogen heterocyclicring quaternary ammonium salt cationic surfactants was identi fied by mass spectrography, nuclear magnetic resonance spectra, infrared spectra and etc.
用质谱法、核磁共振波谱法、红外光谱法等，确定了未知氮杂环季铵盐型阳离子表面活性剂的结构。
3
An organic coordination (complexing) compound in which the metal ion is bound to atoms of nonmetals, e. g. nitrogen, carbon, or oxygen, to form a heterocyclicring having coordinate covalent bonds.