Crystal structure of dicaesium octa-µ₃-chloro-hexachloro-octahedro-hexa-tungstate(II) and -molybdate(II) complexes

Abstract

almost the same as the Mo-Mo distance (2-61-2-64 A) in (M06X8)4f.5-7 In contrast, the two-electron oxidation of the more weakly bound (Nb6X12)2+ increases the Nb-Nb distance from 2.92 to 3.016 and decreases the Nb-(axia1)Cl distance from 2-60 to 2.48 A.

From Cs2Mo6Cl14 to Cs2Mo6Cl14·H2O and Vice Versa: Crystal Chemistry Investigations

“…As earlier reported in the publication of Healy et al [32], the systematic extinctions observed on the crystal data of Cs 2 Mo 6 Cl 14 allow structural refinements in two In the centrosymmetric space group P-31c, all crystallographic sites are fully occupied by the respective atoms except one of the two Cs cationic sites. Cs atoms are located on two Wyckoff positions: Cs1 on 4e (0, 0, z) with a 50% occupancy factor and Cs2 on 2c (1/3, 2/3, 1/4).…”

“…The synthesis of Cs 2 Mo 6 Cl 14 powder was performed according to a derivative method from that reported by Healy et al [32]. In a first step, (H 3 O) 2 Mo 6 Cl 14 Á7H 2 O was prepared as single crystals using the method reported by Koknat et al [30].…”

Darstellung, Schwingungsspektrum und Kristallstruktur von (n-Bu4N)2[(W6Cl6i)F6a] · 2 CH2Cl2 und19F-NMR-spektroskopischer Nachweis der gemischten Clusteranionen [(W6Cl6i)FnaCl{6-n}a]2-, n = 1-6

“…Durch Umsetzung von (n-Bu 4 N) 2[ (W 6 Cl i 8 )Cl a 6 ] mit CF 3 COOH in Dichlormethan wird zuna È chst ein Gemisch der Clusteranionen [(W 6 Cl i 8 )( CF 3 COO) a n Cl a 6Àn ] 2± , n = 1±6, hergestellt. In diesen lassen sich die in a È uûerer Spha È re koordinierten Trifluoracetatoliganden durch Behandlung mit NH 4 F leicht substituieren, und es bilden sich die Komponenten der Reihe [(W 6 Cl i 8 )F a n Cl a 6Àn ] 2± , n = 1±6, die durch die charakteristischen chemischen Verschiebungen der 19 Synthesis, Vibrational Spectra, and Crystal Structure of (n-Bu 4 N) 2 2± , n = 1±6…”

“…By treatment with NH 4 F the outer sphere coordinated trifluoracetato ligands are easily substituted and the components of the series [(W 6 Cl i 8 )F a n Cl a 6Àn ], n = 1±6 are formed and characterized by their distinct 19 F NMR chemical shifts. An X-ray structure determination has been performed on a single crystal of (n-Bu 4 N) 2 C vib = 3 A 1g + 3 E g + 2 T 1g + 4 T 2g + A 2u + E u + 5 T 1u + 3 T 2u .…”

Syntheses and Crystal Structures of the Cluster Compounds A2[(W6Br8i)Br6a] with A = K, Rb, Cs

“…2). The structure is that of the mixed cluster compounds Cs 2 [(M 6 Cl 8 )Br 6 ] (M = Mo, W) described in space group P31c [14], but it seems to us that the choice of the lower space group is artificial and without any proof of a solution with split positions with the cations. Cs1 is sixfold coordinated by Br a ligands at the corners of a strongly flattened octahedron with d(Cs±Br) = 3.603 A Ê .…”