2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/112167The magnetic susceptibility, and low-temperature magnetization curve, of the [3 x 3] grid [Mn(III)4Mn(II)5(2poap-2H)6](ClO4)10.10H2O is analyzed within a spin Hamiltonian approach. The Hilbert space is huge (4,860,000 states), but the consequent use of all symmetries and a two-step fitting procedure nevertheless allows the best-fit determination of the magnetic exchange parameters in this system from complete quantum mechanical calculations. The cluster exhibits a total spin S = 1/2 ground state; the implications are discussed.28 double-spaced pages, 7 figures, 2 tablesStrongly Correlated ElectronsMesoscale and Nanoscale Physicstext