A new twist in anion binding: metallo-helicate hosts for anionic guests

Dalton Transactions : an International Journal of Inorganic Chemistry
Sandrine Goetz, Paul E Kruger

Abstract

The condensation of 5-chlorocarbonyl-2,2'-bipyridine with a variety of rigid aromatic diamines, L, gave a series of new bisamido-2,2'-bipyridine based ligands (L = 4,4'-methylenediamine, L1; L = 1,1-bis(4-aminophenyl)cyclohexane, L2; L = 1,1-bis(4-amino-3,5-dimethylphenyl)cyclohexane, L3) capable of forming dinuclear triple helicate complexes on coordination to Fe(II). The reaction of various Fe(II) salts with gave: {[Fe2(L1)3](BF4)4, 1; [Fe2(L1)3](ClO4)4, 2; [Fe2(L1)3]Cl4, 3; [Fe2(L1)3](SO4)2, 4; [Fe2(L2)3](BF4)4, 5; [Fe2(L2)3]Cl4, 6; [Fe2(L3)3](BF4)4; 7; [Fe2(L3)3]Cl4, 8; and [Fe2(L3)3](SO4)2, 9, as determined by UV-Vis, IR and 1H NMR spectroscopy, electrospray mass spectrometry (ESMS) and elemental analyses. A UV-Vis complexometric titration experiment between L3 and Fe(BF4)2 established conclusively a [Fe2(L3)3]4+ product species. 1H NMR spectroscopy showed that the complexes exist as both rac-(helical) and meso-(non-helical) isomers in DMSO-d6 solution at 298 K. L1-L3 were designed such that following complexation, six amide hydrogen atoms would line an inter-strand intrahelical cavity of sufficient size to facilitate the binding of guest species within it. Indeed, ESMS studies showed characteristic peaks typical of comple...Continue Reading

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Citations

Nov 21, 2007·Chemical Communications : Chem Comm·Cidália M G dos SantosThorfinnur Gunnlaugsson
Nov 12, 2009·Chemical Communications : Chem Comm·Zhan Zhang, David Dolphin
Jun 14, 2013·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sreedhar K VellasJames D Crowley
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Sep 3, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Alan FergusonPaul E Kruger
Oct 6, 2015·Chemical Communications : Chem Comm·Stephanie A Boer, David R Turner
Aug 5, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Amit AdhikarySanjit Konar
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Aug 14, 2020·Chemistry : a European Journal·Alexiane ThevenetSanta Jansone-Popova
Dec 22, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Liao-Yuan YaoShu-Yan Yu
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Oct 12, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Rosanna J ArcherPaul E Kruger
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Jul 27, 2021·Frontiers in Chemistry·Lynn S LisboaJames D Crowley

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