Further Insights into the Role of Temperature in the Synthesis of the Lanthanide(III)‐Pyrazine‐Octacyanotungstate(V) System: an Example of Discrete Materials

Abstract

AbstractSlow diffusion reactions of Ln3+ (Ln = Ce, Eu, Tb) ions, pyrazine, and the [W(CN)8]3– unit at 0 °C produced three discrete coordination compounds [Ln(H2O)5(CH3CN)2][W(CN)8]·0.5pyrazine·CH3CN·2H2O [Ln = Ce (1), Eu (2)] and [Tb(H2O)6(CH3CN)2][W(CN)8]·pyrazine·2CH3CN·3H2O (3). Single crystal X‐ray diffraction analysis revealed that compounds 1 and 2 are isomorphous and adopt a rare centrosymmetric tetranuclear square unit, while compound 3 exhibits an ion‐pair moiety, in which unique tetramer water clusters (H2O)4 are involved. The presence of different types of hydrogen‐bonding interactions is responsible for the formation of three‐dimensional supramolecular networks. The isolations of compounds 1–3 provide a further insight into the effect of temperatures on constructions and structures of the lanthanide(III)‐pyrazine‐octacyanotungstate(V) system.