crystal structure of na3mocl6晶体结构的na3mocl6.pdfVIP

Crystals 2011, 1, 99-103; doi:10.3390/cryst1030099 OPEN ACCESS crystals ISSN 2073-4352 /journal/crystals Short Communication Crystal Structure of Na MoCl 3 6 Martin Beran and Gerd Meyer * Department für Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany; E-Mail: beran@uni-koeln.de * Author to whom correspondence should be addressed; E-Mail: gerd.meyer@uni-koeln.de; Tel.: +49-221-470-3262; Fax: +49-221-470-5083. Received: 10 May 2011; in revised form: 25 May 2011 / Accepted: 23 June 2011 / Published: 4 July 2011 Abstract: The ternary chloride Na MoCl is obtained as red crystals from a 3 6 disproportionation reaction of molybdenum dichloride, {Mo6 }Cl12, in an acidic NaCl/AlCl3 melt at 350 °C. The crystal structure (trigonal, P-31c, a = 687.1(1), c = 1225.3(2) pm, Z = 2, V = 501,0(1) 106 3 pm ) is that of Na CrCl : within a hexagonal closest-packing of 3 6 chloride ions two thirds of the octahedral voids are filled between the AB double layers + 3+ + with Na /Mo , and between the BA layers with Na . Keywords: molybdenum; chloride; sodium; synthesis; crystal structure 1. Introduction In their lower oxidation states, the early transition metals of the fourth and fif