NMR investigations of Co(III) coordination compounds oriented in a dilute lyotropic liquid crystal.
A swollen lamellar phase, based on sodium dodecyl sulfate, pentanol and NaBr brine, was examined by means of NMR spectroscopy of isotopes with quadrupolar characteristics, namely 2H, 17O, 23Na and 81Br, present at natural abundance. Such a dilute lyotropic liquid crystal was capable of inducing a preferential orientation of the cobalt coordination compounds [Co(en)3]3+ and Co(acac)3, the 59Co NMR signals of which displayed quadrupolar splittings. Moreover, it imparted alignment in the magnetic field to the organocobaloxime [ClCD2Co(Hdmg)2H2O], as shown by the quadrupolar splitting of the deuterium of the axial ligand.
Dipartimento di Scienze Chimiche, Università di Trieste, via L. Giorgieri 1, I-34127 Trieste, Italy. pellizer@dsch.univ.triests.it
Giorgio
G
Pellizer
Fioretta
F
Asaro
Barbara
B
Pergolese
D001965:Bromides / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis* / Q000737:chemistry*; D003102:Colloids / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D003461:Crystallography / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008968:Molecular Conformation; D044367:Phase Transition; D017670:Sodium Compounds / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions
D001965:Bromides; D003102:Colloids; D017670:Sodium Compounds; D012996:Solutions; D012967:Sodium Dodecyl Sulfate; D003035:Cobalt; C027938:sodium bromide