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055ChemInform Abstract The slow and rapid thermal decomposition of group IA (Na+, K+, Rb+) and first-row transition-element (Co2+, Ni2+, Zn2+) propiolate salts is investigated by TGA, DSC, and IR spectroscopy. The detailed study of the thermolysis of group IA propiolate salts permits the thermolysis behavior of more complex transition-metal propiolates to be predicted and rationalized. The approximate gas product ratios (CO, CO2, C2H2) and the tendency to form coupled products (acetylenedicarboxylates) or carbonates can be judged from the decomposition temp. alone of the salts.

Metal complexes having the potential to modify the burn rate of rocket propellants are described. These are the diaminoglyoxime (DAG) complexes: Co(DAG–H)2·DAG, Cu(DAG–H)2·DAG, Ni(DAG–H)2 and Pd(DAG–H)2. The thermal decomposition was characterized by DSC, TGA and IR spectroscopy at a heating rate of 5°C/min, and by fast thermolysis/FTIR spectroscopy at 100–250°C/s. The M(DAG–H)2 complexes are more thermally stable than M(DAG–H)2·DAG. However, all of the compounds produce highly thermally stable residues which would be expected to retard the heat and mass transfer at a burning surface. The residues most closely resemble coordination complexes of the metal and polymeric cyclic azine compounds. The crystal and molecular structure of the previously unreported complex Ni(DAG–H)2·HCL is described.

The slow and rapid thermal decomposition of group IA (Na+, K+, Rb+) and first‐row transition‐element (Co2+, Ni2+, Zn2+) propiolate salts is investigated by TGA, DSC, and IR spectroscopy.