Anthryl-functionalized cyanide-bridged Fe/Co cubes

Two anthryl-functionalized cyanide-bridged [Fe4Co4] cube complexes, [( pzTp)Fe(CN)(3)Co (TpEtOAn)](4)[OTf] (4)center dot 8MeCN center dot 7Et(2)O (1) and [NEt4](3)[( pzTp)Fe(CN)(3)Co(TpEtOAn)](4)[OTf] (7)center dot 5MeCN center dot 2Et(2)O (2) ( pzTp- = tetrapyrazolylborate, TpEtOAn = 2,2,2-tris-(pyrazol-1-yl)ethoxy(9-methyl-anthracene)), were synthesized and characterized. The crystallographic study revealed that the [Fe4Co4] cubes are arranged into a linear supramolecular chain through significant anthryl-anthryl pi pi stacking interactions in complex 1, whereas a zigzag supramolecular 1D assembly is observed in 2. The magnetic measurements showed that both compounds exhibited incomplete transitions from the paramagnetic {Fe-LS(III) (mu-CN)Co-HS(II)} state to the diamagnetic {Fe-LS(II) (mu-CN)(CoILS)-I-II} state at about 200 K. The luminescence measurement of 1 in solution revealed an enhancement of the emission upon dilution or addition of perfluoronaphthalene (PFN) molecules, which could be attributed to the suppression of the aggregation-caused quenching (ACQ) effect, suggesting possible aggregation of the cube units in the solution.

Automated summary

Two anthryl-functionalized cyanide-bridged [Fe4Co4] cube complexes were synthesized and characterized. The crystallographic study revealed linear and zigzag supramolecular structures for complex 1 and complex 2, respectively. Magnetic measurements showed incomplete transitions in both compounds and luminescence measurements indicated an enhancement of emission in complex 1.