10.1021/ic8002492.s001 Marta Viciano-Chumillas Marta Viciano-Chumillas Stefania Tanase Stefania Tanase Ilpo Mutikainen Ilpo Mutikainen Urho Turpeinen Urho Turpeinen L. Jos de Jongh L. Jos de Jongh Jan Reedijk Jan Reedijk Mononuclear Manganese(III) Complexes as Building Blocks for the Design of Trinuclear Manganese Clusters: Study of the Ligand Influence on the Magnetic Properties of the [Mn<sub>3</sub>(μ<sub>3</sub>-O)]<sup>7+</sup> Core American Chemical Society 2008 Trinuclear Manganese Clusters ligand metal ions antiferromagnetic intramolecular interactions hydroxyphenyl H 2phpzMe complexes 1 Mn Complexe susceptibility studies intramolecular interactions Building Blocks Ligand Influence Magnetic Properties H 2phpzH crystal structure terminal positions manganese 2008-07-07 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Mononuclear_Manganese_III_Complexes_as_Building_Blocks_for_the_Design_of_Trinuclear_Manganese_Clusters_Study_of_the_Ligand_Influence_on_the_Magnetic_Properties_of_the_Mn_sub_3_sub_sub_3_sub_O_sup_7_sup_Core/2929441 The synthesis, crystal structure, and magnetic properties of three new manganese(III) clusters are reported, [Mn<sub>3</sub>(μ<sub>3</sub>-O)(phpzH)<sub>3</sub>(MeOH)<sub>3</sub>(OAc)] <b>(1)</b>, [Mn<sub>3</sub>(μ<sub>3</sub>-O)(phpzMe)<sub>3</sub>(MeOH)<sub>3</sub>(OAc)]·1.5MeOH <b>(2)</b>, and [Mn<sub>3</sub>(μ<sub>3</sub>-O)(phpzH)<sub>3</sub>(MeOH)<sub>4</sub>(N<sub>3</sub>)]·MeOH <b>(3)</b> (H<sub>2</sub>phpzH = 3(5)-(2-hydroxyphenyl)-pyrazole and H<sub>2</sub>phpzMe = 3(5)-(2-hydroxyphenyl)-5(3)-methylpyrazole). Complexes <b>1</b>−<b>3</b> consist of a triangle of manganese(III) ions with an oxido-center bridge and three ligands, phpzR<sup>2−</sup> (R = H, Me) that form a plane with the metal ions. All the complexes contain the same core with the general formula [Mn<sub>3</sub>(μ<sub>3</sub>-O)(phpzR)<sub>3</sub>]<sup>+</sup>. Methanol molecules and additional bridging ligands, that is, acetate (complexes <b>1</b> and <b>2</b>) and azide (complex <b>3</b>), are at the terminal positions. Temperature dependent magnetic susceptibility studies indicate the presence of predominant antiferromagnetic intramolecular interactions between manganese(III) ions in <b>1</b> and <b>3</b>, while both antiferromagnetic and ferromagnetic intramolecular interactions are operative in <b>2</b>.