Host–Guest Hydrogen Bonding Varies the Charge‐State Behavior of Magnetic Sponges

Abstract The electron‐donor(D) and ‐acceptor(A)‐assembled D2A‐layer framework [{Ru2(m‐FPhCO2)4}2TCNQ(OMe)2]⋅nDCE (1‐nDCE; m‐FPhCO2−=m‐fluorobenzoate; TCNQ(OMe)2=2,5‐dimethoxyl‐7,7,8,8‐tetracyanoquinodimethane; DCE=1,2‐dichloroethane) undergoes drastic charge‐ordered state variations via three distinct states that are a two‐electron‐transferred state (2e‐I), a charge‐disproportionated state (1.5e‐I), and a one‐electron‐transferred state (1e‐I), depending on the degree of solvation by nDCE. The pristine form 1‐4DCE has a paramagnetic 2e‐I state, which eventually produces the solvent‐free form 1 in 1.5e‐I via an intermediate state 1‐nDCE (n≤1) in 1e‐I. Resolvation of 1 stabilizes 1‐DCE, allowing it to switch between 1.5e‐I and 1e‐I, and to become ferrimagnetic with a Tc of 30 K (1.5e‐I) and 88 K (1e‐I). The stabilization of the 1e‐I state of 1‐DCE is due to the presence of host–guest hydrogen bonding that enables to suppress the electron‐donation ability of D even in an identical framework with 1.