Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Zeitschrift für Naturforschung B

A Journal of Chemical Sciences


IMPACT FACTOR 2017: 0.757

CiteScore 2017: 0.68

SCImago Journal Rank (SJR) 2017: 0.277
Source Normalized Impact per Paper (SNIP) 2017: 0.394

Online
ISSN
1865-7117
See all formats and pricing
More options …
Volume 69, Issue 11-12

Issues

Gilded Chalices: Tetra-aurated Calix[4]arenes

Ulf H. Strasser
  • Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Beate Neumann
  • Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Hans-Georg Stammler
  • Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Raphael J. F. Berger
  • Materialchemie, Paris-Lodron-Universität Salzburg, Hellbrunner Str. 34, A-5020 Salzburg, Austria
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Norbert W. Mitzela
  • Corresponding author
  • Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-03-19 | DOI: https://doi.org/10.5560/znb.2014-4149

Abstract

5,11,17,23-Tetrakis(trimethylsilylethynyl)-25,26,27,28-tetra-n-propoxycalix[4]arene (1) was synthesised in two steps starting from 25,26,27,28-tetra-n-propoxycalix[4]arene, and the structure of 1 was determined by X-ray diffraction. Compound 1 was desilylated (K2CO3) to give 5,11,17,23- tetrakis(ethynyl)-25,26,27,28-tetra-n-propoxycalix[4]arene (2), which was tetra-aurated under basic conditions (NaOEt, THF) with a series of phosphane-gold chlorides (o-Tol3PAuCl, Ph3PAuCl, Ph2MePAuCl, PhMe2PAuCl, Me3PAuCl, Cy3PAuCl, t-Bu3PAuCl) to afford in good to excellent yields the tetra-aurated tetraethynylcalix[4]arene species 3-9 in one step [with phosphane ligands o-Tol3P (3), Ph3P (4), Ph2MeP (5), PhMe2P (6), Me3P (7), Cy3P (8), t-Bu3P (9)]. All compounds were characterised by 1H NMR and infrared spectroscopy, mass spectrometry and by elemental analyses, additionally 3, 4, 5, 8 and 9 by 13C{1H}, and 3-6, 8 and 9 by 31P{1H} NMR spectroscopy. The molecular structures of complexes 3 and 9 were determined by X-ray diffraction and show pinched-cone conformations, but neither intra- nor intermolecular attractive aurophilic Au···Au contacts. The acceptor ability of complexes 3 and 9 was investigated by complexation attempts with various phosphane-gold chlorides and xenon gas under pressure, but interactions could not be determined experimentally. The formation of a complex between xenon and gilded calix[4]arene could, however, be predicted for fluorine-substituted species and with very small phosphane ligands (PH3) on the basis of quantum-chemical calculations; the energy of formation is 9:6 kJ mol-1. The crystal structure of Ph2MePAuCl was also determined and shows Au···Au-bonded dimers.

Keywords: Gold; Xenon; Calix[4]arenes; Ethynes; Acceptor; Crystal Structure; Quantum-Chemistry

About the article

Received: 2014-07-10

Published Online: 2015-03-19

Published in Print: 2014-12-01


Citation Information: Zeitschrift für Naturforschung B, Volume 69, Issue 11-12, Pages 1061–1072, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.5560/znb.2014-4149.

Export Citation

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung.

Comments (0)

Please log in or register to comment.
Log in