CH103PSET22010 - order of decreasing crystal field...

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Professor: Chris Chang Due: Thursday, Sept. 23, 2010 GSIs: Dana Levine, Sara Thoi Chemistry 103 Problem Set #2 1) Using Crystal Field Theory (CFT), draw a d-orbital splitting diagram for an ML 4 square planar complex. 2) For the following complexes, determine the formal oxidation state of the metal center(s), the d electron count for the metal center(s), and the total electron count for the complex a. b. N N N N Fe H 2 O c. d. N Cu N S S NH HN Cys Met His His
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e. f. N N N N O O O O Fe O - 3) For each of the following octahedral metal complexes, i) decide whether the complex will be high-spin or low-spin, ii) give the metal oxidation state and d-electron configuration [(t 2g ) n (e g ) m ], and iii) calculate the Crystal Field Stabilization Energy (CFSE). a. [MnF 6 ] 4- f. [Ru(NH 3 ) 6 ] 2+ b. [Fe(H 2 O) 6 ] 2+ g. [Co(H 2 O) 6 ] 2+ c. Cr(CO) 6 h [V(CO) 6 ] - d. [Ni(CN) 6 ] 4- i. [Cr(NH 3 ) 6 ] 3+ e. [Co(en) 3 ] 3+ j. [Rh(PMe 3 ) 6 ] 3+ 4) Assign the following biological ligands as π -acceptor, π -donor or σ -donor and rank them in
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Unformatted text preview: order of decreasing crystal field splitting ability: Cys-Glu CO His H 2 O Met CN-Tyr NH 3 NO 5) Arrange the following six ligands in order of increasing ability to form stable complexes and account for your order. Optional Problems: 1. Given the generic metal complex, predict which metal would be most likely to bind, and provide a brief rationale for your selection. S S S S M n M O O N O O N O O O O n Cu 2+ , Au +1 , Pd Ca 2+ , Cu 1+ , Fe 3+ 2. Ammonia is an important component of fertilizer, made by the Haber-Bosch process (N 2 + 6e-+ 6H + b 2NH 3 ). Nitrogenases carry out this process in nature. A nitrogenase is a metalloenzyme made up of an iron (Fe) protein and a molybdenum-iron (Mo-Fe) protein that uses ATP to convert N 2 into NH 3 . Draw the valence bond diagram and the molecular orbital diagram for NH 3 ....
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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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CH103PSET22010 - order of decreasing crystal field...

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