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Synthesis and circular dichroism spectra of silver(I) complexes with R,R-DIOP (4R,5R-trans-4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyl-1,3-dioxalane): crystal structures of [AgCl(R,R-DIOP)]2·2CHCl3, {[AgBr(R,R-DIOP)]2}2·CH2Cl2·2H2O, [AgI(R,R-DIOP)]2 a