Electron paramagnetic resonance studies of manganese(II) and nickel(II) in three structural phases of rubidium magnesium chloride and the crystal structure of 6H-rubidium magnesium chloride

The crystal structure of TlMgCl3 from 290 K to 725 K

“…The coordination polyhedra of the chloride ions are distorted ClMg 2 Tl 4 octahedra with the Mg 2+ ions in a cis disposition for Cl1 and a trans disposition for Cl2. The title compound is isostructural with RbMgCl 3 as reported by Devaney et al (1981) and RbMnCl 3 as reported by Goodyear et al (1977), who describe the structure in more detail. This structure is more complex than that of CsMgCl 3 (McPherson et al, 1970), which also has space group P6 3 /mmc but only requires two formula units per unit cell and has an AB hexagonal stacking sequence of the chloride ions in the c-axis direction.…”

Formation of Unsaturated C3 Hydrocarbons by the Protolysis of Magnesium Sesquicarbide with Ammonium Halides

“…194) with its crystal structure isotypic to that of RbMgCl 3 . Its high-temperature modification is isotypic to another modification of RbMgCl 3 , crystallizing in the same space group . Because during ex situ experiments the latter modification turned out to be stable at room temperature as well, it may be concluded that for NH 4 MgCl 3 , similar to RbMgCl 3 , the thermodynamic stabilities of the two lattice types are not dramatically different …”

“…Its high-temperature modification is isotypic to another modification of RbMgCl 3 , crystallizing in the same space group . Because during ex situ experiments the latter modification turned out to be stable at room temperature as well, it may be concluded that for NH 4 MgCl 3 , similar to RbMgCl 3 , the thermodynamic stabilities of the two lattice types are not dramatically different 1 New Phases That Have Been Obtained as Intermediates in the Protolysis Reaction of Mg 2 C 3 with NH 4 Cl new phase(NH 4 ) 2 MgCl 4 NH 4 MgCl 3 NH 4 MgCl 3 (HT) space group I 4/ mmm (No.…”

“…NH 4 MgCl 3 crystallizes in the hexagonal space group P 6 3 / mmc (No. 194) with its crystal structure isotypic to that of RbMgCl 3 . Its high-temperature modification is isotypic to another modification of RbMgCl 3 , crystallizing in the same space group .…”

ɛ-RbCuCl3, a new polymorph of rubidium copper trichloride: synthesis, structure and structural complexity

“…The Rb1 atom is located between three [Cu 2 Cl 9 ] 5À dimers, with an average <Rb1-Cl> bond length of 3.508 Å , whereas the Rb2 atom is located in the framework channels with an average <Rb2-Cl> bond length of 3.555 Å . In terms of perovskite-type nomenclature, the crystal structure of "-RbCuCl 3 can be described as a distorted version of the 4H perovskite structure type (the ideal version with the P6 3 /mmc space group is realized in the crystal structure of one of the polymorphs of RbMgCl 3 ; Devaney et al, 1981). Another example of an orthorhombically distorted 4H perovskite type with the C222 1 space group is CsCuBr 3 (Li Refined as an inversion twin Absolute structure parameter 0.495 19Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL2014 (Sheldrick, 2015), DIAMOND (Brandenburg & Putz, 1999) and OLEX2 (Dolomanov et al, 2009).…”