A solvothermal reaction of SnCl4·5H2O, Mn and Se in ethanolamine (Hea) yielded a novel 2-D Mn selenidostannate(iv) [Mn7(ea)6(SnSe4)2]n (1), which not only provides the first example of the incorporation of a hepta-nuclear Mn cluster [Mn7(ea)6]8+ into a selenidostannate(iv) framework, but also shows unusual spin canting behavior.