Nitrogen-Rich Compounds of the Lanthanoids: The 5,5'-Azobis[1H-tetrazol-1-ides] of the Light Rare Earths (Ce, Pr, Nd, Sm, Eu, Gd)

Autor(en)

Gerald Giester, Georg Steinhauser, Nicolae Leopold, Christoph Wagner, Max Bichler, Johannes H. Sterba, Bernhard Lendl, Mario Villa

Abstrakt

On the occasion of Carl Auer von Welsbach's 150th birthday in 2008, we investigated the 5,5-azobis[1H-tetrazol-1-ides] (C2N; (ZT)2-) of the light lanthanoids (Ln) cerium, praseodymium, neodymium, samarium, europium, and gadolinium. Their synthesis was performed by crystallization from aqueous solutions of disodium 5,5-azobis[1H-tetrazol-1-ide] and the respective lanthanoid nitrate. All compounds are isotypic (triclinic space group P-1) and crystallize according to the general formula [Ln(H2O)7]2(ZT)310 H2O. The crystal structures of all compounds were determined. A distinct lanthanoid contraction could be established, clearly observable by the decrease in the bond lengths in the LnNO7 polyhedra from the Ce to the Gd compound. Further, and in contrast to the previously published 5,5-azobis[1H-tetrazol-1-ides] of the heavy yttric earths, the light Ln cations in this study are coordinated not only by H2O molecules but also by one (ZT)2- anion. Further characterization was performed by vibrational (IR and Raman) spectroscopy and elemental analysis.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Technische Universität Wien

Journal

Helvetica Chimica Acta

Band

92

Seiten

2038-2051

Anzahl der Seiten

14

ISSN

0018-019X

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 104015 Organische Chemie, 104002 Analytische Chemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a54acbe2-d110-4160-9ede-0dcf5bd8c1b8