Two Mercury Chloro Thiocyanate Complexes: NH4[HgCl2(SCN)] and NH4[HgCl(SCN)2]

Single crystals of NH₄[HgCl₂(SCN)] ( 1 ) and NH₄[HgCl(SCN)₂] ( 2 ) are obtained by slow evaporation of ethanol solutions of HgCl₂ and NH₄SCN or Hg(SCN)₂ and NH₄Cl. 1 crystallizes in the monoclinic space group P2₁ (a = 9.297(1), b = 4.171(1), c = 9.198(1)Å, β = 92.827(5)°). The structure consists in HgCl₂(SCN) linear chains, extending along the twofold axis, connected through the ammonium ions. 2 crystallizes in the monoclinic space group C2/c (a = 7.088(1), b = 19.986(2), c = 5.958(1)Å, β = 100.718(5)°). The structure consists of HgCl(SCN)₂ molecules connected through the ammonium ions. The second order non linear optical properties of 1 are discussed.     

Synthese et caracterisation de fluorotellurates IV alcalins et d'ammonium partie II: Etude des fluorotellurates d'ammonium NH4TeF5 et (NH4)2TeF6

New methods of synthesis:

• •reaction of aqueous or anhydrous HF with TeO₂ and NH₄F or NH₄HF₂, with (NH₄)₂TeCl₆
• •reaction of TeF₄ with NH₄F or NH₄HF₂
• •reaction of NH₄HF₂ with TeO₂

have been investigated for NH₄TeF₅ and a new compound (NH₄)₂TeF₆. The resulting compounds have been analysed and characterized.     

Tin(II) Fluoride Compounds with Mixed Acidoligands: Synthesis and Crystal Structure of NH4[SnF2(NCS)]

The NH₄[SnF₂(NCS)] compound was obtained and its structure was determined. The tin atom is surrounded by two fluorine atoms (Sn–F 2.060 Å) and one nitrogen atom of the NCS group (Sn–N 2.351 Å). The coordination polyhedron of tin(II) is a distorted trigonal pyramid with a stereochemically active lone electron pair at the vertex.     

Zwei Mercuri‐Ammin‐Komplexe: [Hg(NH3)2][HgCl3]2 und [Hg(NH3)4](ClO4)2

Two Mercuric Ammoniates: [Hg(NH₃)₂][HgCl₃]₂ and [Hg(NH₃)₄](ClO₄)₂ [Hg(NH₃)₂][HgCl₃]₂ ( 1 ) is obtained by saturating an equimolar solution of HgCl₂ and NH₄Cl with Hg(NH₂)Cl at 75 °C. 1 crystallizes in the orthorhombic space group Pmna with a = 591.9(1) pm, b = 800.3(1) pm, c = 1243.3(4) pm, Z = 2. The structure consists of linear cations [Hg(NH₃)₂]²⁺ and T‐shaped anions [HgCl₃]^—. The coordination sphere of mercury is ?effectively”? completed to compressed hexagonal bipyramids and distorted octahedra, respectively. Single crystals of [Hg(NH₃)₄](ClO₄)₂ ( 2 ) are obtained by passing gaseous ammonia through a solution of mercuric perchlorate, while the solution was cooled to temperatures below 10 °C. 2 crystallizes in the monoclinic space group P2₁/c with a = 791.52(9) pm, b = 1084.3(2) pm, c = 1566.4(2) pm, β = 120.352(1)°, Z = 4. The structure consists of compressed [Hg(NH₃)₄]²⁺ tetrahedra and perchlorate anions. The packing of the heavy atoms Hg and Cl is analogous to the baddeleyite (α‐ZrO₂) type of structure.     

Crystal structure determination of complexes of monomethylammonium chloride and mercury(II) chloride: CH3NH3HgCl3, (CH3NH3)2HgCl4, and CH3NH3Hg2Cl5

The crystal structures have been determined of CH₃NH₃HgCl₃, (CH₃NH₃)₂HgCl₄, and CH₃NH₃Hg₂Cl₅. In (CH₃NH₃)₂HgCl₄ the Hg^II atom is tetrahedrally coordinated by four Cl atoms with Hg? Cl bond lengths of 2.464 to 2.478 Å. In the other two compounds the Hg^II atom is involved in two short covalent Hg? Cl bonds, forming a pseudo HgCl₂ molecule and two much longer bridging Hg? Cl bonds. The methylammonium groups are connected by hydrogen bonds to the chlorine atoms. The nature of the hydrogen bonding scheme probably causes disorder of the methylammonium groups.     

Zur Kenntnis der Sulfito-kobalt(III)-Ammine. II. [CoSO3NCS(NH3)4] und [CoSO3SCN(NH3)4]

Sulphito Cobalt(III) Ammines. II. [CoSO₃NCS(NH₃)₄] and [CoSO₃SCN(NH₃)₄] The brown complex [CoSO₃NCS(NH₃)₄] · 2 H₂O formed from aqueous solutions contains N-bonded thiocyanate as concluded from his IR spectrum. After dehydration the red complex [CoSO₃SCN(NH₃)₄] containing S-bonded thiocyanate has been formed. The conversion of the two isomers is favoured by the trans effect of the sulphito group.     

Ammonium and potassium fluoromonooxalatomanganates(II), A[MnF(C2O4)] (A = NH4 or K) and sodium fluoromonooxalatomanganate(II) dihydrate,Na[MnF(C2O4)] · 2H2O

Summary Light pink-white microcrystalline ammonium and potassium fluoromonooxalatomanganates(II), A[MnF(C₂O₄)] (A = NH₄ or K), and sodium fluoromonooxalatomanganate(II) dihydrate, Na[MnF(C₂O₄)] · 2H₂O, have been synthesized by two different methods. Either KMnO₄ is reduced in the presence of 40% HF and alkali metal oxalate, A₂C₂O₄ (A = NH₄, Na or K), or MnO(OH) in 40% HF reacts with A₂C₂O₄. Characterisation was made by elemental analyses, determination of oxidation states, magnetic susceptibility measurements and infrared spectral studies.     

Refinement of the Molecular Structure of Ammonium Pentachloroaquaferrate (NH4)2[FeCl5(H2O)]

Russian Journal of Coordination Chemistry - The crystal structure of ammonium pentachloroaquaferrate (NH4)2[FeCl5(H2O)] is refined (CIF file CCDC no. 1831198). Compounds...