Spin-canted Mn-Mn coupling in symmetry-broken metal chloride dimer with dual-responsive luminescence and sensing.

ABSTRACT: Magneto-optical coupling provides a powerful alternative to crystal field engineering for modulating Mn²⁺ luminescence. However, precise control over Mn-Mn coupling is hindered by the complex spin-electron super-exchange interactions. Herein, we report a symmetry-broken Mn(II) chloride dimer, (C₁₀H₂₀O₅Mn)(CH₃CN)MnCl₄, synthesized through a crown-ether-assisted supramolecular strategy. The dimer features a 7-coordinated pentagonal bipyramid and a 4-coordinated tetrahedron linked by a distorted Mn-Cl-Mn bridge (129°), which promotes rare spin-canted Mn-Mn coupling and creates a novel Mn-Mn luminescent center. This center exhibits a red emission at 638 nm with an unusually short lifetime of 0.42 ms, which is attributed to the r

SUBMITTER: Zhou G 

PROVIDER: S-EPMC12852691 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature