Organic spin clusters: annelated macrocyclic polyarylmethyl polyradicals and a polymer with very high spin S=6-18

Chemistry : a European Journal
Andrzej RajcaRonald L Cerny

Abstract

Synthesis and magnetic studies of annelated macrocyclic polyradicals and a related high-spin polymer with macrocyclic repeat units are described. Polyarylmethyl polyether precursors to the polyradicals and the related polymer are prepared by using Negishi cross-coupling of difunctionalized calix[4]arene-based macrocycles. The three lowest homologues, with high degree of monodispersity, are tetradecaether (14-ether) 3-(OCH(3))(14), octacosaether (28-ether) 4-(OCH(3))(28), and dotetracontaether (42-ether) 5-(OCH(3))(42), in which 2, 4, and 6 calix[4]arene-based macrocycles are annelated to the center macrocycle, respectively. The evidence for their annelated structures (ladder connectivities) is based upon FAB-MS and the (1)H NMR based end-group analysis. The absolute masses (4-12 kDa) were determined by FAB-MS and GPC/MALS. Small angle neutron scattering (SANS) provides the radii of gyration of 1.7, 2.0, and 3.2 nm for 4-(OCH(3))(28), 5-(OCH(3))(42), and polymer 6-(OCH(3))(n), respectively. The corresponding polyarylmethyl polyradicals 3 and 4, and polymer 6 possess average values of S approximately 6-7, S approximately 10, and S approximately 18, respectively, as determined by SQUID magnetometry and numerical fits to linear com...Continue Reading

Citations

May 19, 2017·Journal of the American Chemical Society·Ying WangAndrzej Rajca
Jan 13, 2015·The Journal of Organic Chemistry·Nolan M GallagherAndrzej Rajca
Jun 28, 2017·The Journal of Organic Chemistry·Ying WangAndrzej Rajca
Mar 27, 2018·Annual Review of Chemical and Biomolecular Engineering·Daniel A WilcoxBryan W Boudouris
Jun 24, 2010·Chemistry : a European Journal·Georges TrinquierJean-Paul Malrieu
Oct 25, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Georges TrinquierJean-Paul Malrieu
Apr 1, 2021·Journal of the American Chemical Society·Chan ShuAndrzej Rajca
May 20, 2009·Chemical Reviews·Katsuyuki HiraiHideo Tomioka
Apr 27, 2021·IScience·Lei QinYan-Zhen Zheng
Jan 8, 2013·Journal of Chemical Theory and Computation·Vincenzo BaroneGiacomo Prampolini
Feb 15, 2012·The Journal of Organic Chemistry·Andrzej RajcaSuchada Rajca
Nov 21, 2013·Journal of the American Chemical Society·Andrzej RajcaSuchada Rajca
Mar 1, 2019·Journal of the American Chemical Society·Nolan GallagherAndrzej Rajca
Apr 23, 2015·The Journal of Organic Chemistry·Arnon OlankitwanitAndrzej Rajca
Sep 14, 2014·Journal of the American Chemical Society·Arnon OlankitwanitAndrzej Rajca
Mar 16, 2011·Journal of the American Chemical Society·Andrzej RajcaSuchada Rajca
Nov 12, 2013·Journal of Chemical Theory and Computation·Vijay Gopal ChilkuriNathalie Guihéry
Jan 19, 2006·Journal of the American Chemical Society·Eiji Fukuzaki, Hiroyuki Nishide
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Aug 19, 2007·The Journal of Physical Chemistry. a·Haibo MaYuansheng Jiang
Apr 13, 2007·The Journal of Physical Chemistry. B·Chandrasekar RajaduraiMartin Baumgarten

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