Circle the Alphabet Segment of Your Last Name : A-G H-L M-P Q-Z

Chem 451 (Spring, 2003) Exam II (100 pts) Name: ------, SSN: ------, March 28, 2003 LAST, First Circle the alphabet segment of your Last Name: A-G H-L M-P Q-Z

Please answer the following questions: Part I: Multiple Choice (30 pts: 6 @ 5 pts). Please circle the ONE best answer:

1. Which one of the following has the largest CFSE?

3+ 3+ a) [Co(CN)6] b) [Cr(NH3)6]

2+ 2+ c) [Ni(NH3)6] d) [Mn(H2O)6]

2. What are the types of isomerism may arise in each of the following pairs?

[Co(NH3)3(NO2)3] & [Co(NH3)6][Co(NO2)6]; [Co(NH3)5(NO2)]Cl2 & [Co(NH3)5(ONO)]Cl2; [Co(NH3)5(SO4)]Br & [Co(NH3)5Br]SO4

a) Coordination, linkage and hydration, respectively b) Polymerization, linkage and ionization, respectively

c) Coordination, linkage and geometrical, respectively d) Polymerization, geometrical and ionization, respectively

2- 3. Predict how many unpaired electrons are in [PtCl4] (square planar)? a) 4 b) 2 c) 0 d) non of the above

4. For which member of the following pairs of complexes would ∆oct be the larger?

2+ 2+ 2+ 3+ 2- 2- [Ni(H2O)6] & [Ni(en)3] ; [Cr(H2O)6] & [Cr(H2O)6] ; [MnF6] & [ReF6] ;

2+ 2+ 2- a) [Ni(H2O)6] , [Cr(H2O)6] , [MnF6] , respectively

2+ 2+ 2- b) [Ni(en)3] ; [Cr(H2O)6] [ReF6] , respectively

2+ 3+ 2- c) [Ni(en)3] , [Cr(H2O)6] , [MnF6] , respectively

2+ 3+ 2- d) [Ni(en)3] , [Cr(H2O)6] ,[ReF6] , respectively

5. Which of the following complexes would show Jahn Teller Effect?

2+ 3+ 2+ 2+ a) [Ni(H2O)6] b) [Cr(H2O)6] c) Zn(NH3)6] d) [Cr(H2O)6]

6. Which of the following species is expected to be diamagnetic?

2- 2+ a) [CoCl4] b) [Co(en)3]

1 3- 4- c) [Fe(CN)6] d) [Fe(CN)6] Part II. (40 pts: 5 @ 8 pts): 1. Write the formula for Tetraamminechromium(III)-μ-amido-μ-hydroxobis(ethylendiamine)iron(III) sulfate

2. What is meant by chelate effect? Give a brief account for Template synthesis:

3. Sketch and state ALL the types of isomerism that may be exhibited by Na[Fe(ox)2(H2O)2] (ox = 2- oxalate ion = C2O4 ). Also, give the name of each complex.

2 4. Explain the electronic spectrum of an aqueous solution of K3[TiF6] . Predict the magnetic moment (spin only) of the complex.

5. Sketch the partial qualitative molecular orbital diagram for metal-ligand π-bonding in octahedral complexes with: (a) π-donor ligands and (b) π-acceptor ligands.

3 Part III. (30 pts) Bonding:

8 2- 2+ 2- 1. (18 pts) The d complexes [NiCl4] and [Ni(en)3] are paramagnetic, whereas [Ni(CN)4] is diamagnetic. Explain these data based on the d orbitals splitting (CFT) diagrams.

2- 2+ 2- [NiCl4] [Ni(en)3] [Ni(CN)4]

2. (12 pts) What is the hybridization of the central nickel atom in each of the above complexes.

4 CHEM 451- Spring-2003 EXAM II

You will have 55 minutes to complete this exam. The exam has 4 pages plus Periodic Table When you are told to do so, tear off the Periodic Table cover sheet and use as required during exam.

1 2 1 H Periodic Table of the Elements He 1.01 4.00 3 4 5 6 7 8 9 10 2 Li Be B C N O F Ne 6.94 9.01 10.81 12.01 14.01 16.00 19.00 20.18 11 12 13 14 15 16 17 18 3 Na Mg Al Si P S Cl Ar 22.99 24.30 26.98 28.08 30.97 32.06 35.45 39.95 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.1 40.08 44.96 47.88 50.94 52.00 54.94 55.85 58.93 58.69 63.55 65.38 69.72 72.59 74.92 78.96 79.90 83.80 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.47 87.62 88.91 91.22 92.91 95.94 (98) 101.1 102.9 106.4 107.9 112.4 114.8 118.7 121.8 127.6 126.9 131.1 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.9 137.3 138.9 178.5 181.0 183.8 186.2 190.2 192.2 195.1 197.0 200.6 204.4 207.2 209.0 (209) (210) (222) 87 88 89 104 105 106 107 108 109 110 111 112 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Uun Uuu Uub (269) (272) (277) (223) 226.0 227.0 (261) (262) (263) (262) (265) (266)

58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.1 140.9 144.2 (145) 150.4 152.0 157.2 158.9 162.5 164.9 167.3 168.9 173.0 175.0 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.0 231.0 238.0 237.0 (244) (243) (247) (247) (251) (252) (257) (258) (259) (260)