Solvothermal synthesis, crystal structures and characterization of open-framework metal (CoII and MnII) phosphites with helical channels and 16-membered rings

We report two novel phosphites [(CH3)2NH2]2M3(HPO3)4 (M = Co(1), Mn(2)) with extra-large 16-membered ring channels and left/right-handed helical channels. Complex 2 represents the first monometallic four-coordinate manganese phosphite. Magnetic studies showed that there exist weak antiferromagnetic interactions between M(II) ions in 1 and 2.266