Poly[guanidinium [tri-mu-formato-kappa O-6:O '-formato-kappa O-2,O '-yttrium(III)]]

In the title coordination polymer, {(CH6N3)[Y(CHO2)(4)]}(n), the yttrium(III) ion is coordinated by one O, O-bidentate formate ion and six mu(2) bridging formate ions, generating a squareantiprismatic YO8 coordination polyhedron. The bridging formate ions connect the metal ions into an anionic, threedimensional network. Charge compensation is provided by guanidinium ions, which interact with the framework by way of N-H center dot center dot center dot O hydrogen bonds. The guanidine molecules reside in porous channels of 3.612 by 8.189 angstrom, when considering the van der Waals radii of the nearest atoms (looking down the aaxis).