Ch103_PS3_2010

Ch103_PS3_2010 - metal complex a b Cr N N N N Fe H 2 O c d...

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Professor: Chris Chang Due: Tuesday, Oct. 19, 2010 GSIs: Sara Thoi, Dana Levine Chemistry 103 Problem Set #3 1) For the following compounds, give the number of d electrons, place them in the appropriate crystal field, and determine whether they are diamagnetic or paramagnetic. Assume all ligands have the same bond length: Rh(PPh 3 ) 3 Cl (square planar); [CuCl 4 ] 2- (square planar); Rh(PMe 3 ) 4 (tetrahedral); Pt(NH 3 ) 2 Cl 2 (square planar); [CuCl 4 ] 3- (tetrahedral). 2) For each of the following compounds: i) Give the oxidation state of the metal, d electron count, and fill in the crystal field diagram (complete with orbital labels). ii) Predict whether the complex would be labile or inert and explain your answer. a) b) c) d) 3) More electron counting! For the following complexes, determine the formal oxidation state of the metal center, the d electron count for the metal center, and the total electron count for the
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Unformatted text preview: metal complex a. b. Cr N N N N Fe H 2 O c. d. Cu O O Cu N N N N 2+ N N O O Mn Cl Optional Problems 1. Determine which of the following is paramagnetic, explain your choice, and estimate its magnetic moment. [Fe(CN) 6 ] 4- [Co(H 2 O) 6 ] 3+ [CoF 6 ] 3- [RhF 6 ] 3- 2. The compound trans-Fe(o-phen) 2 (NCS) 2 has a magnetic moment of 0.65 Bohr magneton at 80 K, increasing with temperature to 5.2 Bohr magnetons at 300K. a. Assuming a spin-only magnetic moment, calculate the number of unpaired electrons at these two temperatures b. How can the increase in magnetic moment with temperature be explained? (Hint: There is also a significant change in the UV-visible spectrum with temperature) 3. The high-spind d 4 complex [Cr(H 2 O) 6 ] 2+ is labile, but the low spin d 4 complex ion [Cr(CN) 6 ] 4-is inert. Explain....
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This note was uploaded on 09/20/2011 for the course CHEMISTRY 120 taught by Professor Head-gordon during the Spring '11 term at ASU.

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Ch103_PS3_2010 - metal complex a b Cr N N N N Fe H 2 O c d...

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