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Unformatted text preview: es can endure many laboratory manipulations, and
as we shall see, some of them can be prepared in structural forms whose stable existence
depends on the durability of the bonds to the cobalt atoms. Cl
H2N Co NH2 NH2
H2N Cl NH2 Co Cl Cl Cis isomer Trans isomer Figure 1. The trans- and cis- isomers of [Co(en) 2Cl2]Cl. 39 In this assignment, you will prepare a complex ion with a net +1 charge in which two
molecules of ethylenediamine (en) and two chloride ions are bonded to a central Co3+ ion.
Each of the two ethylenediamine molecules is attached to the Co3+ ion via the lone pairs
on the basic nitrogen atoms at each end of ethylenediamine. Thus, six atoms (four
nitrogen atoms and two chlorine atoms) are directly bonded to the cobalt atom and form
the corners of an imaginary octahedron (eight-faced solid) with the cobalt atom at the
center (see Figure 1). Notice that there are two possible structures for the complex. In
one structure (the cis- isomer), the two chlorine atoms occupy adjacent corners of the
octahedron. In the other st...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07