New metal-anion radical framework materials: CoIIcompounds showing ferromagnetic to antiferromagnetic phase transition at about 344 K, and ZnIIcompounds exhibiting terminal anion ligand induced direct white-light-emissionElectronic supplementary information (ESI) available: Selected bond distances and angles for 1–4; structure diagrams; figures of the PXRD, IR, EPR and PL. CCDC reference numbers 779456–779458. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c0dt01667e

The preparation, X-ray crystallography, EPR, magnetic and luminescent investigation of new metal-anion radical framework materials based on a new anion radical ligand generated by in situdeprotonation of a stable zwitterionic radical are described herein. N,O,N-tripodal anion radical ligand (bipo−) links metal cations, giving rise to four isostructural one-dimensional metal–organic frameworks, [M(bipo−)(L)]n[M = Zn, L = HCOO−(1), SCN−(1a), N3−(1b); M = Co, L = Br−(3)]. The tripodal bipo− ligand and one co-ligand, 1,4-benzenedicarboxylate, coordinate to metals leading to two isostructural two-dimensional metal–organic frameworks, [M(bipo−)(BDC)0.5]n[M = Zn (2) and Co (4)]. The two CoIIcompounds are the first examples that exhibit unusual ferromagnetic to antiferromagnetic phase transition with transition temperature over room temperature, which can be demonstrated by the cooling and warming measurements of susceptibility. Compound 4also exhibits long-range magnetic ordering with the critical temperature at about 44 K proved by ac susceptibility measurements. The metal-radical frameworks exhibit distinctly different fluorescence emissions. Especially, the isomorphous one-dimensional ZnIIcompounds show interesting terminal anion ligand-induced photoluminescent color changes, including direct and invariable white-light-emission with terminal SCN−ligand. [ABSTRACT FROM AUTHOR]