Preparation, Analytical, IR Spectral, and Thermal Studies of Some New Hydrazinium Carboxylates

Table 3

TG-DTA data.

S. no	Compound	DTA peak temp. (°C)	Thermogravimetry (TG)			Decomposition product
			Temp. range °C	Mass loss (%)
				Obsd	Cald
1		99 (+)	25–133	5.18	6.49	Dehydration
	Hydrazinium 2,4-dichlorophenylacetate hydrate	211 (+)	133–286	79.43	81.54	Decomposition to formic acid
		269 (−)
		305 (−)	286–329	90.38	90.91	Decomposition to carbon residue
2		99 (+)	25–90	—	—	Melting
	Hydrazinium phenoxyacetate hydrate	149 (−)	90–234	50.41	53.51	Decomposition leads to phenol
		265 (−)
		327 (−)	234–344	97.6	—	Decomposition to carbon residue
3		170 (+)	103–225	18.21	18.39	Dehydration and dehydrazination
	Hydrazinium 2,4-dichlorophenoxyacetate hydrate	285 (−)	225–528	96	—	Complete decomposition to carbon residue
		488 (−)
4		106 (+)	25–86	1	—	Removal of moisture
	Hydrazinium diphenylacetate hydrate	186 (−)	86–354	81.51	82.53	Dehydration and dehydrazination leads to formic acid
			233 (−)
		484 (−)	354–483	97	—	Complete decomposition to carbon residue
5		92 (+)	25–102	9.67	9.03	Dehydration dehydrazination
	Hydrazinium cinnamate hydrate	150 (+)	102–150	25.04	26.13
		289 (−)	150–481	98.41	—	Decomposition to carbon residue
		458 (−)
6		121 (+)	25–99	—	—	Removal of moisture
	Hydrazinium picolinate	155 (−)	99–218	87.70	—	Decomposition to carbon residue
		191 (+)
7	Hydrazinium nicotinate	117 (+)	25–127	3.69	—	Removal of moisture
		183 (−)	127–304	90.20		Decomposition to carbon residue
		282 (+)