Cobalt (Ii) Oxygen

2734 words 11 pages
Cobalt(II) Oxygen adduct complex
Inorganic 461 lab
2-29-2012

Abstract
This experiment uses Co(salen) as a model compound illustrating the uptake of oxygen in hemoglobin. SalenH2 was prepared as the intermediate, and reacted with hydrated cobalt to prepare Co(salen). Using Co(salen) the oxygen up-take was tested. The synthesis of SalenH2 produced 0.65 g. The percent yield of salenH2 was 116% on the filter paper and 105% after transferring salenH2 to a vial. The melting point of salenH2, was 128 oC. The color of salenH2 was yellow. This was all expected from salenH2. The synthesis of Co(salen) produced 0.232 g. The percent yield of Co(salen) was 88.22% on the filter paper and 86.1 % after transferring the Co(salen) to a vial. Co(salen)
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This information was provided in Microscale Inorganic chemistry textbook1.
Table 1: Chemical Data of Compounds(1) Compound | FW | Amount | mmol | mp (oC) | bp (oC) | Density | Salicylaldehyde | 122.12 | 450 μL | 4.09 | | 197 | 1.146 | Ethylenediamine | 60.10 | 140 μL | 2.00 | | 118 | 0.899 | salenH2 | 268.32 | | | | | | Co(II) acetate tetrhydrate | 249.09 | | | | | 1.705 |

* The following table provides the amount of product calculated from both part A and B. This table also contains percent yields from part A and B. The following calculations are provided in the calculation section.
Table 2: Mass of SalenH2 and Co(salen) Compound | Weight | Theoretical yield | % yeild | salenH2 on weight paper | 0.65 g | 0.56 g | 116 % | SalenH2 vial | 0.598 g | 0.56 g | 105 % | Co(Salen) filter paper | 0.232 g | 0.26 g | 88.22 % | Co(Salen) vial | 0.224 g | 0.26 g | 86.1% |

Percent Yields and Calculations:
Part A: Syntheses of salenH2
To determine the liming reagent, the following calculations were needed.
Calculations for limiting reagent:
Salicyladehyde:
ρ salicyladhyde=1.146 g/ml 450μL=400*10-3ml (amount used)(density)(1FW)=mol (calculation 1)
(450μL Salicyladehyde)(1.146g1ml)(1mol122.12 g Salicyladehyde )(1 mol salenH22 mol salicyladhyde)= 2.11mmol salenH2
Ethylenediamine was calculated using equation 1: ρ Ethylenediamine=0.899 g/ml 140

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