Four 3-cyanodifurazanyl ethers: potential propellants.

Area of Science:

• Organic Chemistry
• Crystallography
• Materials Science

Background:

• Previous research synthesized and characterized several difurazanyl ether compounds.
• This study expands on prior work by including new cyanodifurazanyl ether derivatives.

Purpose of the Study:

• To compare the structural characteristics of synthesized difurazanyl ethers.
• To investigate the influence of substituents on the difurazanyl ether core structure.
• To analyze crystal packing and density correlations in these compounds.

Main Methods:

• X-ray crystallography was used to determine the structures of seven difurazanyl ether compounds.
• Comparative analysis of geometric parameters and conformational differences.
• Calculation and correlation of crystal density with molecular density (M/V).

Main Results:

• Difurazanyl ether fragments showed consistent geometric parameters across all studied compounds, indicating substituent independence.
• Conformations varied, with compounds exhibiting either approximate C(2) or C(s) symmetry.
• All hydrogen-free compounds displayed dense crystal packing (1.626-1.898 Mg m(-3)).
• A linear correlation was established between crystal density and molecular density.

Conclusions:

• Substituents do not significantly alter the core geometric parameters of difurazanyl ether fragments.
• Conformational flexibility exists within the difurazanyl ether framework, leading to different symmetry types.
• Dense crystal packing is a common feature of these nitrogen-rich, hydrogen-free compounds.
• A predictive relationship exists between crystal density and molecular density for these compounds.