Molekülverbindungen mit Ansolvosäuren. II. RAMAN‐ und Ultrarotspektren von Heterocyclen mit Borfluorid und Aluminiumchlorid

Abstract

In einer selbstgebauten RAMAN‐Apparatur für Festkörper‐Aufnahmen und einem handelsüblichen Ultrarotspektrometer wurden die Grundschwingungsspektren von Aluminiumchlorid‐ und Borfluoridverbindungen des Pyridins, Chinolins und Isochinolins gemessen. In Anlehnung an die Spektrenzuordnung der Grundsubstanzen werden die Spektren der Analagerungsverbindungen diskutiert. Sie folgen im wesentlichen den für Aromaten mit elektronegativen Substituenten gefundenen Gesetzmäßigkeiten. Die Darstellung der Substanzen wird beschrieben.

Vibrational Spectroscopy of N-Methyliminodiacetic Acid (MIDA)-Protected Boronate Ester: Examination of the B–N Dative Bond

“…A year later, Taylor et al pointed out that the few already recorded spectra of amine boranes had an unexpectedly high value for the B–N stretch . For example, this motion in species such as BF 3 NH 3 , C 5 H 5 NBF 3 , H 3 NB(CH 3 ) 3 , and (CH 3 ) 3 NBH 3 had been previously assigned to between 980 and 1255 cm –1 . These authors asserted that the stretching frequency should be much lower in energy.…”

Description and Application of Microwave Titrations. Determination of the Reaction Rate and Stoichiometric Composition of Complexes.

“…Coleman et al Using aqueous thiocyanate solutions and anion resin, Teicher and Gordon (15) separated Fe+3 and Al and Turner, Philp, and Day (16) separated Cr+s from gc anc) Ni and Co from Fe+3. Hamaguchi and workers (6)(7)(8)(9) have used aqueous NH4SCN-HCI solutions to separate Sc from a number of metals on anion or cation resins and to study the thiocyanato-chloro complexes of some other metals. Korkisch and Hecht (10) separated Ga from Fe+3 on anion resin.…”

“…If recovery or analysis of the separated metal is desired, one is faced with removing or analyzing for the metal ion in presence of large concentrations of thiocyanate salts. In part, this problem has been overcome by employing NH4SCN-HC1 mixtures as eluting agent (6)(7)(8)(9). Another approach to the problem, which is considered in this report, is the use of an organic solvent mixed with the aqueous thiocyanate salt solution.…”