Analogous Chain Selenite Chlorides BaM(SeO)Cl (M = Cu, Ni, Co, Mn) and PbCu(SeO)Cl with Tunable Spin : Syntheses and Characterizations.

A series of analogous chain selenite chlorides BaM(SeO)Cl (M = Cu , Ni , Co , Mn ) and PbCu(SeO)Cl with tunable spin from = 1/2 to = 5/2 have been hydrothermally synthesized and characterized. These analogues crystallized in the orthorhombic space group (monoclinic 2/ space group for ) all containing M-SeO-M spin chains, which are further separated by the Ba ions (Pb for ). The magnetic susceptibility results of , , and show broad maxima around 80.0, 18.9, and 78.0 K, respectively, indicating good one-dimensional (1D) magnetism. Meanwhile, no long-range order (LRO) is observed down to 2 K for both and , while the isostructural compounds , , and exhibit LRO at 3.4 K, 10.8 K, and 5.7 K, respectively, which are further confirmed by the heat capacity and electron spin resonance results, as well as the observed spin-flop transitions in the - curves measured at 2 K below . The magnetizations of - at 7 T are still far from saturation. In addition, thermal stability and FT-IR and UV-vis-NIR spectroscopy of - are reported.