Polynuclear chromium ascorbate complexes were isolated and physicochemically analyzed in a comparative manner with their mononuclear analog (1). Characterization by elemental analysis, electronic, vibrational, 13 C-n.m.r and mass spectroscopies, and variable temperature magnetic susceptibility studies, allowed structural proposals for the binuclear, [Cr 2 (l-OH) 2 (H 2 O)(C 6 H 7 O 6 ) 3 (OH)] AE 4H 2 O (2), and trinuclear, [Cr 3 (l-O) 3 (H 2 O) 6 (C 6 H 7 O 6 ) 3 ] AE 4 H 2 O (3) complexes. The pseudo-octahedral Cr III centers were suggested to be connected through hydroxo bridges in (2) and in (3) by oxo bridges forming a hexocyclic ring.
Die dreizähnigen Liganden S‐Methyl‐β‐N‐(2‐hydroxyphenyl)‐methyliden‐ (H2Sal) und S‐Methyl‐β‐N‐(2‐pyridyl)‐methyliden‐dithiocarbazon (HPyr) reagieren in unterschiedlicher Weise mit Diorganozinn(lV)‐oxiden. Mit dem erstgenannten Liganden zu dem fünffach koordinierten Komplex R2SnSal mit trigonal bipyramidaler Struktur, in der Reaktion mit dem zweiten Liganden zu dem Zweikernkomplex [(R2SnPyr)2CO3] mit einem Carbonatanion als Brückenligand. Die Strukturaufklärungen erfolgten mittels Röntgenkristallstrukturanalyse und in Lösung mit multinuklearer NMR‐Spektroskopie. IR‐ und massenspektrometrische Messungen ergänzen die Aussagen.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.