Templating metallocycles with a macrocycle: synthesis, structures and magnetic studies of {Cr11M2} complexes

Rajeh Alotaibi; Adam Brookfield; Jonathan M Fowler; George F S Whitehead; Selena J Lockyer; Grigore A Timco; David Collison; Jürgen Schnack; Richard E P Winpenny

doi:10.1039/d2dt03368b

Templating metallocycles with a macrocycle: synthesis, structures and magnetic studies of {Cr₁₁M₂} complexes

Dalton Trans. 2022 Dec 20;52(1):20-23. doi: 10.1039/d2dt03368b.

Authors

Rajeh Alotaibi^{1

2}, Adam Brookfield¹, Jonathan M Fowler¹, George F S Whitehead¹, Selena J Lockyer¹, Grigore A Timco¹, David Collison¹, Jürgen Schnack³, Richard E P Winpenny¹

Affiliations

¹ Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK. richard.winpenny@manchester.ac.uk.
² Department of Chemistry, King Saud University, Riyadh 11451, Saudi Arabia.
³ Faculty of Physics, P.O. Box 100131, Bielefeld University, D-33501 Bielefeld, Germany.

Abstract

Addition of 1,4,8,11-tetrazacyclotetradecane (cyclam) to a reaction that produces octametallic rings when simpler amines are used, produces {Cr₁₁M₂} "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.