Syntheses and Characterization of Two Dicyanamide Compounds Containing Monovalent Cations: Hg2[N(CN)2]2 and Tl[N(CN)2]

Inorganics

Richard Dronskowski¹  Markus Mann¹  Olaf Reckeweg¹  Richard Goddard²  Nils Nöthling² 

[1] Chair of Solid-State and Quantum Chemistry, Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany;Max-Planck-Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany;

关键词: dicyanamide;    mercury;    thallium;    crystal structure;    volume chemistry;    IR spectrum;    metathesis;   

DOI  :  10.3390/inorganics6040135

来源: DOAJ

【 摘 要 】

Crystals of Hg₂[N(CN)₂]₂ were grown by a slow diffusion-reaction between aqueous Hg₂(NO₃)₂·2H₂O and Na[N(CN)₂]. Hg₂[N(CN)₂]₂ adopts the triclinic space group P $\overline{1}$ (no. 2) with a = 3.7089(5), b = 6.4098(6), c = 8.150(6) Å, α = 81.575(6)°, β = 80.379(7)°, γ = 80.195(7)°, and Z = 1. Crystals of Tl[N(CN)₂] were obtained from the reaction of TlBr with Ag[N(CN)₂] in water. Single-crystal structure analyses evidence that Tl[N(CN)₂] is isotypic to α-K[N(CN)₂] and adopts the orthorhombic space group Pbcm (no. 57) with a = 8.5770(17), b = 6.4756(13), c = 7.2306(14) Å, and Z = 4. Regarding volume chemistry, the dicyanamide anion occupies ca. 44 cm³·mol⁻¹, and so it corresponds to a large pseudohalide. The IR spectra of both compounds exhibit vibrational modes that are characteristic of the dicyanamide anion.

【 授权许可】

Unknown