Thermochemical Behavior of Crystalline Copper–Zinc Complexes of Nitrilotris(methylenephosphonic) Acid

• Published in: Russian journal of applied chemistry Vol. 95; no. 4; pp. 519 - 528
• Main Authors: Chausov, F. F., Kazantseva, I. S., Lomova, N. V., Kholzakov, A. V., Shabanova, I. N., Suksin, N. E.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2022; Springer Nature B.V
• Subjects: Chemical composition; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Clusters; Crystal lattices; Crystal structure; Crystallinity; Decomposition; Differential thermal analysis; Industrial Chemistry/Chemical Engineering; Inorganic Synthesis and Industrial Inorganic Chemistry; Photoelectrons; Thermal stability; Thermodynamic properties; nitrilotris(methylenephosphonic) acid; thermal decomposition; copper–zinc complexes; X-ray photoelectron spectroscopy
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427222040073

The thermal behavior and mechanism of decomposition of crystalline heterometallic chelate complexes in the concentration substitution series Na
4
[Cu
x
Zn
1–
x
N(CH
2
PO
3
)
3
]·13H
2
O (0 <
x
< 1) were studied by thermal gravimetric and differential thermal analysis and by X-ray photoelectron spectroscopy. The decomposition temperature depends on the composition of the heterometallic complexes and configuration of dimeric clusters in their crystal lattice. The heterometallic complex with
x
= 1/4 shows the highest thermal stability (decomposition onset at approximately 280°С) because of the lowest strain in the structure of the complex anion. Changes in the chemical composition of the complex with
x
= 1/2, whose crystal structure is built of clusters of identical composition, starts already at 250–290°С, but gaseous products are released only at 300–408°С.