Coordination of electron pair donors at the titanium atom leads to stabilization of imidotitanium complexes, which are of interest as catalysts for C‐H activations and polymerizations. Thus, reaction of the thiophosphinic acid amide 1 with TiCl4 and subsequent treatment of the initial product with pyridine enables the synthesis of the orange‐red, crystalline title compound 2. The titanium atom exhibits distorted octahedral coordination; the length of the Ti‐N bond is 172.0(2) pm.
A transient ionospheric travelling convection vortex (ITCV) event was recorded by the EISCAT magnetometer cross in northern Scandinavia on April 21, 1986 around 8:40 MLT. Simultaneously, the near‐conjugate satellite VIKING observed strong magnetic and electric field variations on closed magnetic field lines. The signatures seen by the spacecraft are consistent with a passage through two oppositely directed field‐aligned current tubes. The total upward and downward currents turned out to be matched within a region of ∼ 1000 km in the ionosphere. Because of the close spatial and temporal proximity of both observations we interpret the field‐aligned currents as being associated with the ITCV. This is the first time that in‐situ measurements of the currents connecting the ITCV to the source region close to the magnetopause have been published. Both the current density and the dimensions of the current tubes could be estimated here.
Reaction of the diphosphene RfP=PRf (Rf = 2,4,6-tris(trifluoromethyl)phenyl-) with red selenium affords the selenadiphosphirane 1. The X-ray crystal structure of 1 was investigated.
The SSC occurring on March 22, 1979, at 0826 UT had an unusually sharp onset in Scandinavia, in Middle Europe and in experiments on the geostationary satellite GEOS 2, which was near noon, local magnetic time. The ground magnetometer stations showed a small preimpulse which started ∼5 s before the main impulse. Both impulses needed ∼2 s to “propagate” from ground stations at L = 6.3–4.6. Search coil magnetometers indicate a very small precursor in northern Finland (L ∼ 4.4–6.0) which started ∼15–20 s before the main impulse. This small precursor also occurred close to the time of the SSC onset at GEOS 2. We interpret this precursor as an effect of precipitating electrons changing the ionospheric conductivity in a localized region. The main impulse triggered damped magnetic pulsations (Psc) with periods near 160 s and 50 s visible in northern Scandinavia and the electric field detector on GEOS 2. Furthermore, the magnetic field and the energetic ions at GEOS observed pulsations with periods near 80 s, but these could only be observed at the northernmost ground stations. There are several indications that the first three harmonics of standing hydromagnetic waves are detected. They may correspond to periodic oscillations of the subsolar point or eigenperiods of the SSC‐excited fast mode (compressional cavity resonance). The tentatively identified second harmonic wave (period ∼80 s) is indicative of a bounce resonance of ring current protons. Inside the plasmasphere the dominant period of a superimposed Psc 4 event increased with latitude for the H component indicating several toroidal eigenoscillations.
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