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The cluster structure of crystalline phases according to TGA/DTA and XPS data in isodimorphic substitution series [Cu x Ni(1−x){N(CH2PO3)3}]Na4·nH2O (x = 0 … 1)

Feodor F. Chausov, Nikita E. Suksin, Aleksandr V. Kholzakov, Natalya V. Lomova, Irina S. Kazantseva, Dmitry S. Rybin

Abstract: The cluster structure, thermochemical behavior, and some mechanisms of thermal decomposition of the crystalline products in the isodimorphic substitution series CuxNi(1−x)NTP (x = 0 … 1) have been studied by simultaneous the thermal gravimetric analysis and differential thermal analysis (TGA/DTA) and X-ray photoelectron spectroscopy (XPS). The complexes NiNTP and Cu1/8Ni7/8NTP with a monoclinic crystal structure are the most thermo-stable and characterized by one-step decomposition at 400–440 °C with the formation of metal phosphides and phosphates. The complexes Cu3/8Ni5/8NTP–Cu3/4Ni1/4NTP with the triclinic crystal lattice and the trigonal-bipyramidal coordination of metal atoms decompose in two steps. Firstly, the formation of a heteroligand complex with imino-bis-methylenephosphonic and methylphosphonic acids takes place at 245 °C. Secondly, the complex decomposes at 270–380 °C. The monometallic complex CuNTP decomposes almost completely at 280–300 °C.
Keywords: copper / nickel / nitrilo-tris(methylenephosphonate)s / thermal analysis / X-ray photoelectron spectroscopy

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