Related Experiment Video
Updated: May 3, 2026
Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
Published on: September 8, 2013
Isostructural Energetic Coordination Compounds Based on 1,2-Dimethylimidazole and Cyanoborohydride toward
Wen-Jing Yang1, Peng-Han Jiang1, Hao-Hui Xie1
1College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, P. R. China.
Abstract:
Advancement in spacecraft propulsion systems has driven the development of hypergolic materials with high volumetric energy density (Ev), short ignition delay (ID) time, and low sensitivity. Traditional unsymmetrical dimethylhydrazine (UDMH) suffers from unsatisfactory Ev, stringent storage requirements, and carcinogenicity. Energetic coordination compounds (ECCs) are promising hypergolic materials that combine high-energy organic components with active metal centers. However, achieving high-performance hypergolic ECCs and elucidating the structure-property relationship for ID time remains challenging. In this study, two isostructural hypergolic ECCs, [Cd(DMI)4(CBH)2] 1 and [Ni(DMI)4(CBH)2] 2, were constructed using 1,2-dimethylimidazole (DMI) as a ligand and cyanoborohydride (CBH-). Both compounds show high energy density, short ID time, and low sensitivity. Ni-based 2 has a higher Ev (31.97 kJ·cm-3) than UDMH (25.60 kJ·cm-3) and ZIF-based materials such as Zn(AIm)2 (19.30 kJ·cm-3) and Co(AIm)2 (19.50 kJ·cm-3). Upon contact with red fuming nitric acid (RFNA), compound 2 exhibits a shorter ID (14 ms) than 1 (19 ms). Theoretical calculations indicate that the shorter ID time of 2 arises from its higher HOMO energy level involving the Ni center, a more electron-rich metal center, and stronger interaction with HNO3, rendering 2 a promising hypergolic material with excellent properties.
More Related Videos
09:37Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
10:17Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
Related Concept Videos
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
01:32Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview
01:10Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism
02:30Stability of Substituted Cyclohexanes
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
02:51Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
01:33Carboxylic Acids to Methylesters: Alkylation using Diazomethane