Abstract
Single crystals of the layered copper hydroxide dodecylsulfate Cu2(OH)3(C12H25SO4) have been obtained for the first time, by controlled hydrolysis of an aqueous copper acetate solution. Interestingly, this compound crystallizes in a noncentrosymmetric space group (P21, a = 5.591(10) A, b = 6.108(11) A, c = 26.96(5) A, α = γ = 90°, β = 92.76°), which is further confirmed by nonlinear optical measurements. Within the course of the synthesis, a probable intermediate between Cu(OAc)2·H2O and the layered Cu2(OH)3(C12H25SO4) was isolated and characterized. X-ray structure analysis showed that this intermediate presents a ribbon-like structure of formula Cu3(C12H25SO4)2(CH3COO)2(OH)2(H2O)2. The magnetic properties of the layered Cu2(OH)3(C12H25SO4) have been analyzed in the high-temperature region (T > 20 K) by considering a high-temperature series expansion for a S = 1/2 Heisenberg two-dimensional triangular lattice. At lower temperature, the compound shows a three-dimensional antiferromagnetic ordering (TN = 1...
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