Abstract
Cis and trans isomers of [Co(metn) 2Cl 2] + (metn = 2-methyl-1,3-propanediamine) have been prepared and characterized. Owing to the presence of rotationally nonequivalent donor atoms in the prochiral ligand, three diastereomers are possible for the cis isomer (C 2( anti), C 2( syn), and C 1) and two diastereomers are possible for the trans complex (C 2h and C 2ν). A crystal structure of the purple compound [Co(metn) 2Cl 2]Cl· 1 4 CH 3OH shows the presence of both the cis C 2( anti) and trans C 2h isomers. An uncompleted structure determination on green [Co(metn) 2Cl 2](H 3O)Cl 2 ·H 2O reveals only the trans C 2h isomer. X-Ray crystallography also shows a flattening of the 6-membered metn chelate ring compared with that of 1,3-propanediamine. Though 13C NMR spectra of trans-[Co(metn) 2Cl 2] + show no evidence for more than one isomer in solution, this may be due to undetectably small chemical shift differences between the two diastereomers possible. IR spectra indicate a solid state cis to trans rearrangement of [Co(metn) 2Cl 2] + in the presence of KBr.
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