You are here: Home :: Area NEM :: Chemistry :: Inorganic chemistry

Alla Arakcheeva, Philip Pattison, Nicolas Meisser, Gervais Chapuis, Igor V. Pekov, Philippe Thélin

New insight into the pectolite – serandite series: a single crystal diffraction study of Na(Ca_1.73Mn_0.27)[HSi₃O₉] at 293 and 100 K

Keywords: Manganoan pectolite, Hydrogen bond, Topology, Single crystal structure analysis, X-ray diffraction

Using synchrotron radiation, a single crystal investigation has been performed at 293 and 100 K for the structural characterization of the manganoan pectolite, Na(Ca_1.73Mn_0.27)[Si₃O₈(OH)] (from the pegmatite at Mt. Koashva, Khibiny alkaline massif, Kola peninsula, Russia). The data obtained are compared with other members of the pectolite – serandite, Na(Ca_2–xMn_x)[Si₃O₈(OH)], series. The strong asymmetric hydrogen bond observed in the other members of the series has been confirmed at 293 K (O3–O4 = 2.473(3) Å; H–O3 = 0.97(4) Å, H … O4 = 1.50(4) Å ; O3–H … O4 = 178(4)°). This bond exhibits strengthening (O3–O4 = 2.458(2) Å) and becomes more symmetric at 100 K (H–O3 = 1.06(4) Å, H … O4 = 1.40(4) Å, O3–H … O4 177(4)°). The data obtained for 293 K confirm the previously hinted tendency: the higher the content of Mn, the more asymmetric the H-bond. The influence of the asymmetric position of the H-bond on the environment close to the bonded O3 and O4 atoms and the H–Na interaction are discussed. The alternative topological role of the hydrogen bond is considered in comparison to a similar structure Li₂Mg₂ [Si₄O₁₁].

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 12/2007
Pages: 696 - 704

Show full article (external site)

Show all available items of this journal

 

Area NEM