Na₂Ti₃Cl₈: von isolierten Ti²⁺‐Ionen zu [Ti₃]⁶⁺‐Clustern

Low Temperature Phases of Na2Ti3Cl8 Revisited

“…Our magnetic measurements widely agree with the previous investigation . The value μ eff = 2.56 μ B was reported at 300 K, which corresponds to χ T = 2.44 cm 3 · K · mol –1 .…”

“…The Rietveld refinements in Figure show very good agreements with the published structural models for the α‐ and γ‐phases . For the β‐phase the structural model of the α‐phase was used and only the lattice parameters were adapted.…”

“…A reduction of μ eff from about 2.2 μ B to 1.65 μ B is reported for the phase transitions and equals our value of 0.8 cm 3 · K · mol –1 for both χ T steps. No further peak below 20 K was observed in the literature …”

“…The high and low temperature crystal structures of Na 2 Ti 3 Cl 8 have been determined by Meyer et al [1] as part of their investigations on reduced titanium halides. [2] The structure of the high temperature phase is shown in Figure 1.…”

Ein Titan‐Quadrat mit zentralem Sauerstoffatom, eingebettet in einem Iod‐Kuboktaeder in dem Salz K4[{Ti4O}I12]

“…Es liegen nun trigonale {Ti 3 } 6+ ‐Cluster mit Einfachbindungslängen von 300 pm vor. Diese Titan‐Dreiecke sind auch von Ti 7 Cl 16 ≙ Ti[{Ti 3 }Cl 8 ] 2 ,3 KTi 4 Cl 11 4 und Na 2 [{Ti 3 }Cl 8 ]5 mit Bindungslängen von 295.4, 295.5 bzw. 299.6 pm bekannt.…”