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Coordination Complexes - Geometrical Isomerism in Octahedral Complexes University of Calgary CHEM 333
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Coordination Complexes - Geometrical Isomerism in Octahedral Complexes Anusha Ambaselkar Lab B05 A-1 Feb 11 2021 Abstract: In this experiment, Dichlorobis(ethylenediamine)cobalt(III) Chloride was synthesized in two forms. The trans isomer was made by mixing cobalt chloride hexahydrate, diamin...

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  • February 6, 2023
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  • 2022/2023
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  • coordination complexes geometrical isomerism in octahedral complexes
  • coordination complexes geometrical isomerism in octahedral complexes anusha ambaselkar lab b05 a 1 feb 11 2021 abstract in thi

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Anusha Ambaselkar


Coordination Complexes - Geometrical Isomerism in Octahedral
Complexes
Anusha Ambaselkar Lab B05 A-1
Feb 11 2021


Abstract:

In this experiment, Dichlorobis(ethylenediamine)cobalt(III) Chloride was synthesized in

two forms. The trans isomer was made by mixing cobalt chloride hexahydrate, diaminoethane,

water and hydrochloric acid and then evaporated and filtered to get a solid product. This product

was heated in an oven to remove the hydrochloric acid which made the final

trans-[Co(en)​2​Cl​2​]Cl (1.455g, 60.3%). A portion of the trans isomer was evaporated in water to

create cis-[Co(en)​2​Cl​2​]Cl solution(6.47%). Both trans (green solution) and cis (purple solution)

isomers were made into diluted solutions in 50mL volumetric flask. A UV-vis spectrophotometer

measured the absorbance and maximum wavelength for both solutions. The molar absorption

coefficient (trans: ​30.306 molLcm ) (cis: 31.565 molLcm ) ​was calculated using the absorbances and

the calculated concentrations for the cis (0.0109M)and trans (0.0108M) isomers. The maximum

wavelengths were compared to the wavelength ranges for the colors absorbed and reflected.

According to the wavelengths from the spectra, the color reflected for the trans (620.1nm)

isomer was green and for this cis (510.0nm) it was red.



Introduction:

Geometric isomerism which is also known as cis and trans isomerism is a form of

stereoisomerism. Cis and trans isomers differ in the position of the ligands for a coordination

complex. For trans molecules, two identical ligands are on the opposite side of the molecules

and for cis, the two ligands are on the same side. For the coordination complexes of

trans-[Co(en)​2​Cl2​ ]Cl
​ ​ and cis​-[Co(en)2​ Cl
​ ​2]Cl
​ ​ synthesized in this experiment, the position of the

two Cl ligands determine whether its a trans or cis isomer.



This study source was downloaded by 100000858936669 from CourseHero.com on 02-06-2023 01:21:35 GMT -06:00


https://www.coursehero.com/file/83007473/Geometrical-Isomerismpdf/

, Anusha Ambaselkar


The purpose of this experiment was to explore the differences between cis and

trans-Dichlorobis(ethylenediamine)cobalt(III) Chloride by obtaining an absorption spectra by

using a Ultraviolet visible spectrophotometer. A UV-vis spectrophotometer refers to absorption

spectroscopy where it measures at what wavelength light is absorbed at for the sample.The

maximum wavelengths determined by the spectra for both isomers were compared to the range

of colors reflected and absorbed at different wavelengths to determine if the experiment was a

success. The absorbance was also measured and the concentrations were calculated for both

to determine the molar absorption coefficient using the Beer-Lambert equation​[1]​.


Product Reactions:

4 CoCl​2​ + 8 en + 4 HCl + O​2​ → 4 ​trans​-[CoCl​2​(en)​2​]Cl + 2 H​2​O

trans​-[CoCl​2​(en)​2​]Cl + H​2​O + heat → ​cis​-[CoCl​2​(en)​2​]Cl + H​2​O

Methods:

Part A: Preparation of trans-[Co(en)​2Cl
​ ​ ]Cl
2 ​


Cobalt chloride hexahydrate (8.6mmol, 2g) and distilled water (5.0mL) in a 250mL

beaker was added. Then a mixture of anhydrous 1,2-diaminoethane (1.0mL) and water (3.0mL)

was added into the chloride solution. Finally, 30% hydrogen peroxide (1.0mL) was added

dropwise to this solution. This solution was heated until the effervescence had stopped (5min)

and after, concentrated hydrochloric acid (5.0mL) was added. The solution was gently

evaporated for another 30min until a dark green thick layer was formed. The beaker was then

placed in an ice water bath (10min). Vacuum filtration was used to filter off the crystals and

washed with 3 small portions of 95% ethanol. Then the powder was placed in an oven (10 min)

to remove the HCl and leave the ​trans-[Co(en)​2Cl
​ ​ ]Cl
2 ​ ​ roduct by itself. This product was a dark
p

green powder.




This study source was downloaded by 100000858936669 from CourseHero.com on 02-06-2023 01:21:35 GMT -06:00


https://www.coursehero.com/file/83007473/Geometrical-Isomerismpdf/

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