Models for biological trinuclear copper clusters. Characterization and enantioselective catalytic oxidation of catechols by the copper(II) complexes of a chiral ligand derived from (S)-(-)-1,1'-binaphthyl-2,2'-diamine

Dalton Transactions : an International Journal of Inorganic Chemistry
Maria Chiara MimmiL Casella

Abstract

The dinuclear and trinuclear Cu(II) complexes of an octadentate ligand derived from (S)-1,1'-binaphthyl-2,2'-diamine have been prepared and characterized by UV/Vis, CD, EPR and NMR spectroscopy. The ligand contains two tridentate aminobis(benzimidazole) donor arms connected to a central bidentate diaminobinaphthyl linker, which hosts the chiral unit. In the dinuclear Cu complex the ligation occurs essentially within the tridentate arms of the ligand. The two Cu centers are EPR nonequivalent and noninteracting. The EPR data suggests that one of the Cu ions additionally interacts with one of the tertiary aminonaphthyl donors. In the trinuclear complex the two aminonaphthyl donors bind the third Cu ion. The EPR spectrum of this complex shows the signal for a mononuclear Cu(II) center bound to a tridentate arm, while the remaining two Cu(II) centers are coupled through hydroxo groups. The CD spectrum shows that in the free ligand a severe reduction of the dihedral angle between the naphthyl groups from the strain free range occurs. This conformation is stabilized by ring stacking interactions with the benzimidazole groups. On complex formation this interaction is removed because the benzimidazole groups are involved in metal bindin...Continue Reading

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Citations

Jun 22, 2013·Chemical Reviews·Scott E AllenMarisa C Kozlowski
Aug 6, 2015·Accounts of Chemical Research·Tanmaya JoshiLeone Spiccia
Jan 20, 2017·Chemical Reviews·Courtney E ElwellWilliam B Tolman
Feb 17, 2017·Chemical Reviews·Vincent C-C WangSunney I Chan
Mar 9, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Maria L PerroneLuigi Casella
Jan 23, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Julia Bernhardette Hildegard StrautmannThorsten Glaser
Jul 12, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Eric C BrownWilliam B Tolman
Aug 19, 2016·Acta Crystallographica. Section E, Crystallographic Communications·Gellert Mezei
Dec 18, 2007·Chemical Reviews·Jean-Claude Kizirian
Sep 24, 2014·Inorganic Chemistry·Xiang-Yuan YangSumod A Pullarkat
May 16, 2019·Inorganic Chemistry·Eliana Lo PrestiEnrico Monzani

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