title: Crystal structure of BaMnB2O5containing structurally isolated manganese oxide sheets.
abstract: In an attempt to search for mixed alkaline-earth and transition metal pyroborates, the title compound, barium manganese(II) pyroborate, has been synthesized by employing a flux method. The structure of BaMnB2O5is composed of MnO5square pyramids that form Mn2O8dimers by edge-sharing and of pyroborate units ([B2O5]4-) that are composed of two corner-sharing trigonal-planar BO3units. These building blocks share corners to form∞2[MnB2O5]2-layers extending parallel to (100). The Ba2+cations reside in the gap between two manganese pyroborate slabs with a coordination number of nine. The title compound forms an inter-esting spiral framework propagating along the 21screw axis. The structure is characterized by two alternating layers, which is relatively rare among known transition-metal-based pyroborate compounds.
authors.affiliation: Division of Chemistry and Biological Sciences, Governors State University, 1 University Parkway, University Park, IL 60484-0975, USA.
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Maschmeyer
authors.affiliation: Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA.
authors.forename: Liurukara D
authors.initials: LD
authors.lastname: Sanjeewa
authors.affiliation: Division of Chemistry and Biological Sciences, Governors State University, 1 University Parkway, University Park, IL 60484-0975, USA.
authors.forename: Kulugammana G S
authors.initials: KG
authors.lastname: Ranmohotti
keywords: bond-valence-sum calculations; crystal structure; inter­planar angle; layered framework; pyroborates