Crystal structure of (μ5-decahydro-closo-decaborato) (μ2-O-dimethylformamide)disilver(I) [Ag2(B10H10)(DMF)]

The compound [Ag-2(B10H10)(DMF)] is synthesized, and its crystal structure is studied (R = 0.0699 for 2836 observed reflections). The coordination number of each of the four independent Ag atoms is 4 + 2. The nearest environment of the Ag(1) and Ag(4) atoms consists of two O atoms of the DMF molecules and two BH groups, and that of the Ag(2) and Ag(3) atoms consists of four BH groups. All the Ag atoms additionally form weak bonds with two BH groups. The Ag-O and Ag-B bonds lie in the ranges 2.319-2.465(9) and 2.46-2.70(1) angstrom, respectively, and the Ag center dot center dot center dot B distances are 2.89-3.25(1) angstrom. Due to the binding of each polyhedral anion to five Ag atoms, layers are formed. Bridging DMF molecules link layers into the three-dimensional framework.