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The reaction of 2-pyridinemethanol with copper 4-fluorobenzoate has yielded a family of type II cubanes with formula [Cu4(pymO)4(4-F-PhCOO)3(NO3)] (), [Cu4(pymO)4(4-F-PhCOO)4] () and [Cu4(pymO)4(4-F-PhCOO)4(H2O)] (). These systems exhibit an unexpected S = 1 ground state and their magnetic properties have been unambiguously characterized and rationalized as a function of the asymmetry of the {Cu4O4} cage and Cu-O-Cu bond angles. Analysis of the coupling constants was performed applying new interaction schemes. Magneto-structural correlations have been performed from the analysis of previously reported type II copper cubanes.

Copper(ii) cubanes with a {Cu4O} core and well defined S = 1 ground state

Copper(ii) cubanes with a {Cu₄O} core and well defined S = 1 ground state