Templating metallocycles with a macrocycle: synthesis, structures and magnetic studies of {Cr 11 M 2 } complexes.
Rajeh AlotaibiAdam BrookfieldJonathan M FowlerGeorge F S WhiteheadSelena J LockyerGrigore A TimcoDavid CollisonJürgen SchnackRichard E P WinpennyPublished in: Dalton transactions (Cambridge, England : 2003) (2022)
Addition of 1,4,8,11-tetrazacyclotetradecane (cyclam) to a reaction that produces octametallic rings when simpler amines are used, produces {Cr 11 M 2 } "pretzels" (M = Zn II or Cu II ) where the cyclam coordinates to the M II ion which then sits at the centre of a twelve-metal macrocycle. Magnetic studies were fitted using the finite-temperature Lanczos method (FTLM), and the results demonstrate that exchange interactions are transferable from previous exchange-coupled Cr III rings.