Coordination Compounds Lab Report

Coordination Compounds are compounds that contain at least one complex ion. Complex ion is an ionic species consisting of a metal ion bounded one or more Lewis bases. Coordination complex is the product of a Lewis acid-base reaction in which neutral molecules bond to a central metal atom by coordinate covalent bonds. A coordinate covalent bond is a covalent bond in which one atom supplies both electrons. Ligands are atoms or molecules with electron pairs available, and they may be neutral or negatively charged. Ligands are usually thought of as electron donors attracted to the metal at the center of the complex. Isomers are different compounds with the same molecular formula. Also, isomers can be recognized into two groups; constitutional isomers and
Enantiomers are stereoisomers whose molecules are non-superposable mirror images of each other. Diastereomers are stereoisomers whose molecules are not mirror image of each other. The Cis and Trans isomers are diastereomers. Cis isomer, also called Z isomer is a molecules with two like groups on the same side of molecules. On the other hands, Trans isomer, also called E isomer is a molecules with two like group on opposite sides of the molecules. The difference between Cis and Trans isomers are that Cis isomers are polar, and Trans isomers are comparatively non-polar, Cis isomers has the higher boiling point compared to the Trans isomers, Trans isomers have a higher melting point compared to the Cis isomers, and Trans molecules are well packed than the Cis molecules. In this experiment, the cobalt (II) chloride hexahydrate is reacted with ethlenediamine (NH2CH2CH2NH2) to form [Co(en)2(H2O)2]Cl. Then hydrogen peroxide is added that changes the charge of cobalt from II to III. Finally, the HCl is added to the solution, that forms [Co(en)2Cl2]Cl. Trans isomer of [Co(en)2Cl2]Cl forms green color, and cis isomers of [Co(en)2Cl2]Cl forms purple