title: Dimensional Reduction From 2D Layer to 1D Band for Germanophosphates Induced by the "Tailor Effect" of Fluoride.
abstract: The "tailor effect" of fluoride, exclusively as a terminal rather than a bridge, was applied successfully to design low-dimensional structures in the system of transition metal germanophosphates for the first time. Two series of new compounds with low-dimensional structures are reported herein. K[M(II)Ge(OH)2(H0.5PO4)2] (M = Fe, Co) possess flat layered structures built from single chains of edge-sharing M(II)O6 and GeO6 octahedra interconnected by HPO4 tetrahedra. Their fluorinated derivatives, K4[M(II)Ge2F2(OH)2(PO4)2(HPO4)2]·2H2O (M = Fe, Co), exhibit band structures of two four-membered ring germanium phosphate single chains sandwiched by M(II)O6 octahedra via corner-sharing. Both of these structures contain anionic chains of the condensation of four-membered rings built from alternating GeO4Φ2 (Φ = F, OH) octahedra and PO4 tetrahedra via sharing common GeO4Φ2 (Φ = F, OH) octahedra, the topology of which is the same as that of the mineral kröhnkite [Na2Cu(SO4)2·2H2O]. Note that the switch from the two-dimensional layered structure to the one-dimensional band structure was performed simply by the addition of a small amount of KF·2H2O to the reaction mixture. This structural alteration arises from the incorporation of one terminal F atom to the coordination sphere of Ge, which breaks the linkage between the transition metal and germanium octahedra in the layer to form the band structure.
authors.affiliation: †Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China.
authors.forename: Chun-Zuo
authors.initials: CZ
authors.lastname: Huang
authors.affiliation: †Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Liu
authors.affiliation: †Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wen
authors.affiliation: ‡Xiamen Zijin Mining and Metallurgy Technology Co Ltd., Xiamen 361101, China.
authors.forename: Rong-Chuan
authors.initials: RC
authors.lastname: Zhuang
authors.affiliation: #School of Materials Science and Engineering, Shanghai University, Shangda Road No. 99, Shanghai 200072, China.
authors.forename: Jing-Tai
authors.initials: JT
authors.lastname: Zhao
authors.affiliation: §Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N5E2, Canada.
authors.forename: Yuanming
authors.initials: Y
authors.lastname: Pan
authors.affiliation: †Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China.
authors.forename: Jin-Xiao
authors.initials: JX
authors.lastname: Mi
authors.affiliation: †Fujian Provincial Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China.
authors.forename: Ya-Xi
authors.initials: YX
authors.lastname: Huang