The crystal structure of legrandite -- Zn2(AsO4)(OH)(H2O), monoclinic, a 12.8052(3), b 7.9249(2), c 10.2173(2) Å, β 104.4329(3)°, V 1004.13(6) Å3, space group P21/c, Z = 2 -- has been refined to an R1 value of 1.2% based on 2844 unique [|Fo| > 4σF] reflections measured with a Bruker D8 three-circle diffractometer equipped with a rotating-anode generator (MoKα X-radiation), multilayer optics, and an APEX-II detector. The legrandite structure is a heteropolyhedral framework of (AsO4) tetrahedra, (Znφ5) square pyramids, and (Znφ6) octahedra [φ = O, (OH), (H2O)] with extensive hydrogen bonding across its interstices. All hydrogen positions were located, all hydrogen bonds were assigned, and the H...O distances are in reasonable accord with the published relation between O–H stretching frequency and H...O bond-length.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址:北京市海淀区学院路29号 邮编:100083 电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700 |