HW2_09 - 7. Select the more acidic acid for each of the...

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Chem 131 Inorganic Chemistry I Assignment 2: Due date: December 3, 2009 1. Give the point group and identify all the symmetry elements for BF 3 . 2. Give the point groups for the following molecules. (a) H 2 C=C=CH 2 (b) OSF 4 (c) XeF 4 3. A square pyramidal metal complex has the molecular formula of ML 2 X 2 E. L, X and E are monodentate ligands. (1) Please sketch all the possible geometric isomers. (2) Point out which one(s) is/are chiral. 4. Please comment on the fact that the only important ore of mercury is cinnabar, HgS, whereas zinc occurs in nature as sulfides, silicates, carbonates, and oxides. 5. Indicate which of the following Lewis bases (ligands) should be able to coordinate through more than one donor atoms, and indicate the hard and soft donor atoms: (a) PO 4 3- (b) S 2 O 3 2- (c) Me 2 P-NMe 2 (d) CO 3 2- 6. (a) Briefly explain why BF 3 is monomeric while “AlCl 3 ” is a dimer. (b) Please sketch their structures and assign point groups to the two molecules.
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Unformatted text preview: 7. Select the more acidic acid for each of the following pair. (a) B(OH) 3 or Al(OH) 3 (b) H 5 IO 6 or H 6 TeO 6 (c) [Fe(H 2 O) 6 ] 3+ or [Sr(OH 2 ) 6 ] 2+ 8. Give the oxidation-state and number of valence shell d electrons of the central metal in the following complexes. (a) [Ru(CN) 5 (H 2 O)] 2-(b) [CoH 2 (PMe 3 ) 4 ] + (c) Mn(NH 2 ) 2 (HN 2 CH 2 CH 2 NH 2 ) 2 (d) RhCl(CO)(PPh 3 ) 3 9. Assign Λ and/or Δ configurations of the following complexes (a) (b) NH 2 Fe Cl Cl NH 2 NH 2 NH 2 HN Fe NH 2 Cl HN NH 2 Cl 10. Consider the C-H σ bond stretching normal modes in benzene. (a) How many such vibration modes does the molecule have? (b) Please draw all the stretching normal modes. (c) Give the symmetry labels to all the normal modes you draw in (b). (d) Point out which are IR active and which are Raman active....
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