Related Experiment Video
Updated: Jun 28, 2026
Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Experimental and theoretical characterization of the hexaazidophosphate(V) ion
P Portius1, P W Fowler, H Adams
1Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom. p.portius@sheffield.ac.uk
Abstract:
(PPN)[P(N(3))(6)] (2) was synthesized by the metathesis of Na[P(N(3))(6)] (1) and (PPN)N(3) (PPN(+) = {(Ph(3)P)(2)N}(+)), allowing for the isolation and full characterization of a stable hexaazidophosphate(V) salt by (31)P and (14)N NMR, UV absorption, IR and Raman spectroscopy, elemental and thermal analyses, X-ray diffraction, and Hartree-Fock and density functional theory calculations. The colorless single crystals of 2 are triclinic, space group P1, a = 9.6296(9), b = 9.8158(9), c = 10.1414(10) A, alpha = 92.635(5) degrees , beta = 93.437(5) degrees , gamma = 92.105(4) degrees , and Z = 1. The [P(N(3))(6)](-) ion of 2 is isolated in the solid state and adopts S(6) symmetry both in the crystal and in solution. Thermogravimetric analysis and differential scanning calorimetry measurements reveal a surprising thermal stability of 2 (T(dec) ca. 200 degrees C). No friction sensitivity was encountered.
Related Concept Videos
02:42Valence Bond Theory
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:27Predicting Molecular Geometry
02:52VSEPR Theory and the Basic Shapes
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...