Lithium fluoride formed in situ is trapped by [TiF3(C5Me5)]2: an equilibrium with cleavage of a Ti–F–Ti bond and a model compound for molecular lithium fluoride

Contrast Enhanced MRI Assessment of Tumor Blood Volume After Application of Electric Pulses

“…To obtain a measure of MR signal intensity proportional to tissue albumin concentration C,., a ASI(t) map was constructed by subtracting the signal intensity before contrast agent was administered from the values after contrast agent was administered on a pixel-by-pixel basis (23)(24)(25)(26). MRI provides a dynamic estimate of tissue &(t), which is equal to the sum of contrast agent concentration in the tissue vascular space G-B(t) plus the concentration in the extravascular interstitial space &-E(t) when tissue-compartment concentrations are expressed in terms of mass of contrast medium per unit volume of whole tissue such that: The method for estimating tissue blood volume has been reported in detail (23,24).…”

“…MRI provides a dynamic estimate of tissue &(t), which is equal to the sum of contrast agent concentration in the tissue vascular space G-B(t) plus the concentration in the extravascular interstitial space &-E(t) when tissue-compartment concentrations are expressed in terms of mass of contrast medium per unit volume of whole tissue such that: The method for estimating tissue blood volume has been reported in detail (23,24). Using the same method, blood volume was calculated on a pixel-by-pixel basis (26).…”

Synthesis, Structural and Chemical Characterization of Unsaturated C4- and C10-Bridged Group-4 ansa-Metallocenes Obtained Through a Ring-Closing Olefin Metathesis Reaction

“…The X-ray crystal structure analysis revealed that the Li ϩ cations of two independent molecules are (electrostatically) coordinated to the pair of chloride ligands [64,65] at the zirconium center in a chelate fashion. The coordination sphere around the lithium ion is complemented by two additional Ϫ ] anion in the adduct 19 contains two C 6 F 5 units that exhibit chelate contacts to two different Li ϩ cations, whereas the remaining C 6 F 5 pair of substituents is oriented away from the alkali metal centres.…”

Organotitanium Fluorides as Matrices for Trapping Molecular ZnF2 and MeZnF

“…We were encouraged by previous reports that known cyclic compounds such as the six-membered ring [Me 2 PÀBH 2 ] 3 show considerable thermal and hydrolytic stability. [6] Thermally induced dehydrocoupling of phosphane ± borane adducts R 2 PH´BH 3 at elevated temperatures (150 ± 200 8C) has been previously used to prepare cyclic phosphinoborane species (mainly six-membered rings of the type [R 2 PÀBH 2 ] 3 ).…”

“…[7,8] We have reinvestigated this ªdehydrocoupling chemistryº (coupling with elimination of hydrogen) with the idea that if lower temperatures could be used and more efficient coupling reactions identified, then linear, high polymeric structures might indeed result. [9,10] The phosphane ± borane adduct Ph 2 PH´BH 3 undergoes dehydrocoupling at 180 ± 190 8C to exclusively and quantitatively yield the cyclic trimer [Ph 2 P À BH 2 ] 3 . [11] However, on addition of about 0. novel linear dimer 1.…”