catena-Poly[[(N,N-dimethylformamide-kappaO)(nitrato-kappaO)silver(I)]-mu-1,2-bis(diphenylphosphino)ethane-kappa(2)P:P'] at 100 and 293 K: temperature effects on the volume of the solvent pocket.

In the title chain compound, [Ag(NO(3))(C(3)H(7)NO)(C(26)H(24)P(2))](n), the bis(diphenylphosphino)ethane (dppe) components lie across centres of inversion. The dppe units link the Ag(+) ions into chains along [100]. A nitrate anion is coordinated to the Ag atom, together with one molecule of N,N-dimethylformamide (DMF) solvent. At room temperature, the coordinated DMF shows a long Ag-O distance [2.620 (3) A] and relatively large thermal motion, while at 100 K the Ag-O distance is shorter [2.5588 (19) A] and the thermal motion is similar to that of the rest of the complex. The behaviour of the DMF molecule is related to the size of the solvent pocket, viz. 146 A(3) at 293 K and 131 A(3) at 100 K.