Studies on the Chemistry of Tetraamminezinc(II) Dipermanganate ([Zn(NH₃)₄](MnO₄)₂): Low‐Temperature Synthesis of the Manganese Zinc Oxide (ZnMn₂O₄) Catalyst Precursor

Abstract

Tetraamminezinc(II) dipermanganate ([Zn(NH 3 ) 4 ](MnO 4 ) 2 ; 1) was prepared, and its structure was elucidated with XRD-Rietveld-refinement and vibrational-spectroscopy methods. Compound 1 has a cubic lattice consisting of a 3D H-bound network built from blocks formed by four MnO

Thermal decomposition of polycrystalline [Ni(NH3)6](NO3)2

“…Taking advantage of the results of our previous investigations [20,[23][24][25][26] and taking into account the results obtained by other researchers [27][28][29][30][31][32][33][34][35][36], the redox process, which takes place during thermal decomposition of [Ni(NH 3 ) 6 ](NO 3 ) 2 , determines that this decomposition may be presented as the following reactions:…”

Studies on the Chemistry of [Cd(NH3)4](MnO4)2. A Low Temperature Synthesis Route of the CdMn2O4+x Type NOx and CH3SH Sensor Precursors

“…Our efforts in growing single crystals of compound 1 were not successful due to the decomposition reaction observed during the crystallization periods. Therefore, Rietveld refinement of the XRD data was performed (Figure 1) on the X‐ray crystallographic parameters of the isomorphous compound 3 5. Compound 1 crystallizes in a close packed cubic lattice of [Cd(NH 3 ) 4 ] 2+ ions, where MnO 4 – anions occupy all the octahedral and half of the tetrahedral interstices.…”

“…Compound 1 crystallizes in a close packed cubic lattice of [Cd(NH 3 ) 4 ] 2+ ions, where MnO 4 – anions occupy all the octahedral and half of the tetrahedral interstices. A comparison of its lattice parameters with the analogous values of the isostructural [Cd(NH 3 ) 4 ](ReO 4 ) 2 ( 4 )3,8 and [Zn(NH 3 ) 4 ]( X O 4 ) 2 [ X = Mn ( 2 )5 and X = Re ( 5 )3 as well as X = Cl ( 8 )9] compounds is shown in Table 1. The room‐temperature powder X‐ray diffraction studies on the perdeuterated analogue ( 1 ‐ D ) showed a lack of isotope effect of the deuterium substitution over the value of the lattice constant and the molar volume of the elementary cell.…”

“…The main feature of the structure is a three‐dimensional Cd–N–H ··· O–Mn hydrogen‐bonded network built from block‐like structural motifs of 4 by 4 [Cd(NH 3 ) 4 ] 2+ and MnO 4 – ions, respectively. There are two crystallographically different anion environments observed in the structure of compound 1 like in the analogous [tetraammine‐cadmium(II)] perrhenate ( 4 ),8 [tetraamminezinc(II)] permanganate ( 3 )5 and perchlorate ( 5 ) salts 9…”

“…The presence of these hydrogen bonds in compound 1 as reactive centers may be the possible reason for the low storage stability and the high reactivity of compound 1 . The closeness of motional barriers of the two types of permanganate ions within the crystalline lattice of compound 1 might cause the lack of band separations and splittings of type 1 and 2 permanganate vibrations comparing to the IR and Raman characteristic of the isomorphous zinc compound 2 5…”