catena-Poly[[triphenyl-tin(IV)]-μ-3-methyl-phenyl-seleninato-κO:O'].

In the polymeric title coordination compound, [Sn(C(6)H(5))(3)(C(7)H(7)O(2)Se)](n), the Sn(IV) atom has a distorted trigonal-bipyramidal geometry, with two O atoms from two symmetry-related bridging seleninate ligands in axial positions and three phenyl groups in the equatorial plane. In the crystal, the complex exhibits a zigzag chain structure running parallel to the c axis. An intra-chain C-H⋯O hydrogen bond is observed.