Cobalt Complexes - 1451 Words

Cobalt Complexes Lab 4 Cobalt and its slew of complex children Abstract: Through a series of substitution reactions, different cobalt ammine complexes were created. These complexes were analyzed via, precipitation and gravimetric measures to determine that the substitution reactions that occurred. Introduction: Coordination chemistry is an important part of inorganic chemistry that involves the association and dissociation of ligands to a metal. The size, shape, and nucleophilic strength of a ligand will determine if a substitution reaction will potentially take place. Also, the charge, size, and oxidation state of the metal will determine how well substitution occurs. Associative substitution†¦show more content†¦Report Step 2: By adding the concentrated acid to carbonatotetraamminecobalt (III), carbonate was lost from the complex and released as carbon dioxide. This allowed for ammonia to take its place and also freed up a space for chloride ion to coordinate. This gave the complex an 18 electron count, stabilizing the compound. The compound was a redish purple color. The step was performed twice due to a small amount of product (1.7421 grams) the first time. This may be because of not getting the reaction hot enough the first time to avoid making aquopentammineco balt (III). The second time 3.4552 grams product was made, giving a total of 5.1973 grams for the two times the step was performed. Experimental Step 3: Preparation of Nitropentamminecobalt (III) Chloride [Co(NH3)5NO2]Cl2: 1.4983 grams of chloropentamminecobalt (III) chloride was added to 15 mL water and 5 mL of 6M NH3. The solution was warmed for about 10 minutes on and off a hot plate until the salt dissolved. The solution was then suction filtered to get rid of any remaining solid, then cooled and slightly acidified using dilute HCl. 1.9986 grams of Na NO2 was added and heated slightly to dissolve the initial red precipitate that formed. Again, the solution was cooled, and 20 mL of 12.1 M HCl was added. Bubbling occurred and yellow-brown crystals were formed. These crystals were filtered off and washed with ethylShow MoreRelatedCoordination Behavior Of New Bis1613 Words   |  7 Pagesreacted with copper(II), nickel(II), cobalt(II), zinc(II), cadmium(II) and dioxouranium(VI) ions, to yield binuclear complexes formulated as [(L)M2(OAc)2(H2O)n(EtOH)m]†¢xH2O†¢yEtOH where L = L1 or L2; M = Cu, Ni, Co, Z n or Cd; n = nil, 1 or 4; m, x and y = nil or 1, [(H2L2)Cd2(OAc)4(H2O)2]†¢EtOH, [(L)(UO2)2(OAc)2(H2O)2Y2]†¢nH2O where L = L1 or L2; Y = nil or H2O; n = 2.5 or 7, [(L3)M2(H2O)6]†¢nH2O where M = Cu or Zn; n = 1 or 6, [(L3)(UO2)2(H2O)4]†¢2.5H2O and dimeric complexes; [(L1)2Ni2]†¢3H2O and [(H2L3)2M2]†¢nH2ORead MoreLab Report on Le Chateliers Principle1363 Words   |  6 PagesI. 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