research papers
A new (N2H4)WO3 compound has been obtained by mixing WO3 and aqueous hydrazine solution at room temperature for 24 h. The reaction is catalyzed by the presence of lithium. X-ray, synchrotron and neutron diffraction techniques have shown that the material crystallizes in trigonal space group P3221 (No. 154). Chains of distorted WO4 tetrahedra extend along the a axis of the unit cell, linked by a corner-sharing oxygen atom: the N2H4 are in the voids between them. The thermal characterization shows that this new compound is stable up to 220°C, greatly beyond the boiling point of N2H4 (114°C); thus making it a promising candidate for catalysis or trapping applications.
Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520619000064/yb5016sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S2052520619000064/yb5016Isup2.hkl |
CCDC reference: 1846977
N2H4WO3 top
Crystal data top
H4N2O3W | V = 268.87 (1) Å3 |
Mr = 263.88 | Z = 3 |
Trigonal, P3221 | Neutron radiation |
Hall symbol: P 32 2" | T = 100 K |
a = 5.79842 (12) Å | white-bluish |
c = 9.2341 (3) Å |
Data collection top
TOF diffractometer POWGEN | Scan method: time of flight |
Radiation source: spallation source, POWGEN | 2θfixed = 90.0000 |
Specimen mounting: 'powder in V container' |
Refinement top
Rp = 1.856 | 3121 data points |
Rwp = 1.487 | 70 parameters |
Rexp = 0.770 | 2 restraints |
RBragg = 4.446 |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
x | y | z | Uiso*/Ueq | ||
W | 0.00000 | 0.1921 (5) | 0.33333 | 0.00222* | |
O1 | 0.1949 (5) | 0.1949 (5) | 0.50000 | 0.0100 (7)* | |
O2 | 0.2351 (5) | 0.4920 (6) | 0.2537 (2) | 0.0054 (4)* | |
N | 0.74930 (18) | 0.74272 (13) | 0.57895 (13) | 0.0065 (3)* | |
H1 | 0.6138 (8) | 0.7952 (10) | 0.6124 (6) | 0.0254 (8)* | |
H2 | 0.6738 (12) | 0.5512 (4) | 0.6141 (6) | 0.0254 (8)* |