Abstract
AbstractFehling's solution is an aqueous alkaline solution (pH ca. 13) of D‐, L‐, or rac‐tartrato‐cuprates(II) and both excess tartrate and hydroxide. The isolation of crystalline solids succeeded for rac‐tartrate‐containing samples. Crystal structure analyses revealed the formulas K8[Cu10(rac‐tartH‐1)4(rac‐tartH‐2)4(H2O)4]·18H2O (1), Li4[Cu2(rac‐tartH‐2‐κ2O1,O2:κ2O3,O4)2]·11.75H2O (2), and Na6[Cu(rac‐tartH‐2‐κ2O2,O3)2]·14H2O (3). The cupric central atom is in a square‐planar tetracoordination in the bis(diolato) chelate in 3, and in square‐pyramidal 4+1 coordination in the mixed carboxylato‐alkoxido chelates 1 and 2. In terms of stoichiometry, 3 is closest to typical Fehling recipes.
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