Structures of Ca and Sr salts with [W(CN)6(bpy)]- ion. Comparative studies to alkali metal salts analogues

Five complexes with the alkaline earth metals salts (Be2 +, Mg2+, Ca2+, Sr2+ and Ba2+) and [W(CN)(6)(bpy)](-) ion have been synthesized. Two of them, Ca[W(CN)(6)(bpy)]ClO4 center dot 3H(2)O and Sr[W(CN)(6)(bpy)]NO3 center dot 2H(2)O, were structurally characterized based on the X-ray analysis of single crystals and compared with series of Me-2[WIV(CN)(6)(bpy)] and Me[WV(CN)(6)(bpy)] complexes (where Me = alkali metal) previously studied. The structure of salt with Ca2+ shows a layered system of cations and anions, with a clearly defined inorganic and organic (bpy) layer, which are connected by pi center dot center dot center dot pi interactions. For structure of Sr2+, the 2,2'-bipyridine ligands present in the structure do not form pi center dot center dot center dot pi interactions as is the case with Ca2+ or the other structures previously studied. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )

Automated summary

Five complexes containing alkaline earth metal salts (Be2+, Mg2+, Ca2+, Sr2+, and Ba2+) and [W(CN)(6)(bpy)](-) ion were synthesized and characterized. The structures of Ca[W(CN)(6)(bpy)]ClO4 center dot 3H(2)O and Sr[W(CN)(6)(bpy)]NO3 center dot 2H(2)O were analyzed using X-ray crystallography and compared with previously studied Me-2[WIV(CN)(6)(bpy)] and Me[WV(CN)(6)(bpy)] complexes.