[CuEn3]MoO4: Synthesis, Structure, Jahn-Teller Effect, Transformations in the Range 100–1263 K

摘要: The crystal structure of [CuEn3]MoO4 (En is ethylenediamine) studied in a range 100–390 K. crystallographic data at 100 K are as follows: = 27.5808(9) A, c 9.9043(4) space group $$P\overline 3 $$ , V 6524.8(4) A3, Z 18. coordination copper atoms distorted square bipyramid. In three crystallographically independent cations. four short Cu-N distances 2.041(2)–2.093(2) two long ones trans position 2.397(2)–2.496(2) A (at 200 these intervals 2.039(4)–2.148(4) and 2.332(2)–2.461(4) respectively). from to 298 K, the transition occurs $$ c1 (a 15.9992(6) 9.9385(4) 2203.17(19) 6) aligned: 2.086(6) 2.162(7) 2.273(8) A. At 390 Jahn-Teller effect disappears 2.153(4) 9.2785(14) 10.0035(18) $$ 1c, 745.8(3) 2). It shown that with increasing temperature 320 average Mo-O decrease 1.766 1.699 ex situ powder X-ray diffraction study formation process metal carbide phases performed during thermal decomposition He atmosphere presence LiH. Starting 973 mixture Mo2C fcc phase based on Cu ≈ 3.65 A) forms.