Reaction of the hydroxyamine 7-chloro-4-(hydroxyamino)quinoline with the triosmium cluster Os 3 -(CO) 10 (NCMe) 2 gave the complex (µ-H)Os 3 (CO) 10 (µ 2 -η 1 -O-C 9 H 6 N 2 Cl) (3), in which a new mode of µ 2 -η 1 -Ooximato ligand bridged two osmium centers by an oxygen atom. This complex was slowly converted to (µ-H)Os 3 -(CO) 10 (µ 2 -η 2 -ON-C 9 H 6 NCl) (4), where an aromatic C-H moiety in the µ 2 -η 2 -ON-oximatoquinoline group formed an unusual short intramolecular C-H‚‚‚O-N hydrogen bond and an intermolecular C-H‚‚‚OdC hydrogen bond simultaneously. The formation of the intramolecular hydrogen bond may provide a stabilization effect for the generation of the η 2 -ON complex 4 and a driving force for the transformation of 3 to 4.
Mithilfe theoretischer Vorhersagen der erforderlichen Struktureigenschaften wurde die Einschlussverbindung von 1‐Bromadamantan mit Thioharnstoff (siehe Bild) als dichroitischer Filter für die Polarisationsanalyse von Röntgen‐Strahlung entwickelt. Der lineare Dichroismus, den die Substanz mit Röntgen‐Strahlung zeigt, bestätigt ihre optimale Eignung für die gewünschten Anwendungen.
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