An oxygen-centered titanium square embedded in a cuboctahedron of iodine in the salt K4[{Ti4O}I12]
A round peg in a square hole: The unusual bonding situation within the cluster ion [{Ti4O}I12]4- (see picture) arises through the optimization of strong Ti-Ti and Ti-O σ bonding as well as to the absence of Ti-Ti multiple (π) bonding and the avoidance of Ti-I antibonding interactions.
First titanium square fragment {Ti4(μ4-Se)(μ2-Se2)4} in its selenoiodide: Synthesis and structure of Ti4Se9I6
The first titanium selenoiodide Ti4Se9I6 was synthesized as black crystals by heating of Ti, Se, and I2 at 250 °C in 5:9:5 M ratio. The crystal structure of the compound was solved by X-ray single-crystal diffra
Poltarak, Pavel A.,Komarov, Vladislav Yu.,Kozlova, Svetlana G.,Sukhikh, Aleksandr S.,Artemkina, Sofya B.,Fedorov, Vladimir E.
On the bonding behaviour of transition metal ions in inorganic solids - Optical and E.P.R. spectroscopic studies on anhydrous phosphates and phosphate-silicates of Ti3+
TiPO4 (green), Ti4P6Si2O25 (purple-red) and TiP3O9 (blue) show a remarkable variety of colours. We compare the results of optical and e.p.r. spectroscopic measurements on these compounds with d-electron energy levels for Ti3+ obtained by using the angular-overlap model. Thus, a unified set of angular-overlap model bonding parameters for the description of the spectroscopic behaviour of Ti3+ in anhydrous phosphates can be derived. The σ-interaction was assumed to depend on the nth power of the Ti-O bond distance, and it was found that optimum agreement with experiment occurred with n = -4.5. For the correct reproduction of the experimentally observed ground-state splittings it is necessary to allow for anisotropic π-bonding interactions between titanium and the oxygen ligands linking Ti-O coordination polyhedra.
Glaum, Robert,Hitchman, Michael A.
p. 1221 - 1228
(2007/10/03)
'Bent copper tube': A new inexpensive and convenient reactor for fluorides of metals in suboxidation states
Bent copper tubes have been successfully used for solid state reactions at high temperature, under nonoxidizing atmosphere. They provide an inexpensive and convenient alternative to gold and platinum for reactions between fluorides, and do not reduce some elements such as tin(II), as nickel does. Solid state NMR studies of fast fluoride ion conductors Pb1-xSnxF2 prepared in copper tubes show that contamination by paramagnetic Cu2+ is minimal. 119Sn Moessbauer spectroscopy is used as a sensitive probe for the formation of SnO2, and indicates that no oxygen leaked in the tubes.
Denes Georges
p. 54 - 59
(2008/10/08)
Mono-η-cycloheptatrienyltitanium Chemistry: Synthesis. Molecular and Electronic Structures, and Reactivity of the Complexes (L = Tertiary Phosphine, O- or N-donor Ligand; X = Cl or Alkyl)
Bis(η-toluene)titanium reacts with cycloheptatriene in the presence of (AlEtCl2)2 at >60 deg C to form and at room temperature 2> (thf = tetrahydrofuran) is also formed.The crystal structure of the latter has b
Davies, Cathryn E.,Gardiner, Ian M.,Green, Jennifer C.,Green, Malcolm, L. H.,Hazel, Nicholas, J.,et al.
p. 669 - 684
(2007/10/02)
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