Journal Title
Title of Journal: J Chem Crystallogr
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Abbravation: Journal of Chemical Crystallography
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Authors: Andreas Lemmerer
Publish Date: 2012/09/18
Volume: 42, Issue: 11, Pages: 1085-1097
Abstract
A number of ammonium carboxylate salts using the cations R1phenylethylammonium R–C and S1phenylethylammonium S–C and the anions 2R3R23diptoluoyloxybutanedioate RRA and 2S3S+23diptoluoyloxybutanedioate SSA were prepared by using different ratios of the R and S cations to the two anions In particular the crystal structures of the ammonium carboxylate salts RA2 ·RRA·H2O·MeOH 1 R–C3 ·S–C·RRA2 ·H2O5 2 R–C·S–C·RRA·H2O8 3 R–C·S–C3 ·RRA2 ·H2O6 ·MeOH 4 S–C2 ·RRA·H2O2 5 R–C2 ·SSA·H2O2 6 and S–C2 ·SSA·H2O·MeOH 7 were synthesized and their solid state structures determined by low temperature single crystal Xray diffraction The molecular salts were prepared by solution crystallization of the carboxylic acids with the respective amines in a 12 stoichiometric ratio and crystallized out as hydrated and solvated salts The salts 1–5 all have the same anion species but with the cation chiral ratio varying from R to S and the salts 6 and 7 feature the SSA anion The crystal structure of 1 belongs to the orthorhombic space group P212121 with a = 798121 b = 1037812 c = 4118976 Å The crystal structure of 2 belongs to the monoclinic space group P21 with a = 1273162 b = 1801073 c = 1509772 Å and β = 1017551° The crystal structure of 3 belongs to the monoclinic space group P21 with a = 1396152 b = 1805492 c = 1513352 Å and β = 1113971° The crystal structure of 4 belongs to the monoclinic space group P21 with a = 1033815 b = 25610912 c = 1334504 Å and β = 915043° The crystal structure of 5 belongs to the orthorhombic space group P212121 with a = 1031042 b = 1344122 c = 2469986 Å The crystal structure of 6 belongs to the orthorhombic space group P212121 with a = 1031493 b = 1343777 c = 24711313 Å The crystal structure of 7 belongs to the orthorhombic space group P212121 with a = 797556 b = 1039467 c = 411863 Å The changes in cation and anion species produces 1D ribbons in 1 and 7 and 2D layers in 2–6 with corresponding changes in the hydrogen bonded ring patterns linking the ionic species together using chargeassisted N+–H···O− O–H···O− and N+–H···O hydrogen bondsThe University of Cape Town is thanked for providing the infrastructure required to do this study and the National Research Fund SFP2006061500015 for the award of a postdoctoral fellowship Prof Luigi Nassimbeni and Prof Susan A Bourne are thanked for inspiring discussions and guidance
Keywords:
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