HW2_09_ans - distance Strong π back donation from F to B which can stabilize the empty p orbital in B However because of the longer Al-Cl bond

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Chem 131 Inorganic Chemistry I Assignment 2: Due date: December 3, 2009 1. D 3h ; E + C 3 + S 3 + 3C 2 + σ h + 3 σ v 2. (a) D 2d (b) C 2v (c) D 4h 3. L M L X X E L M X L X E L M E X X L L M X E X L X M E L L X X M L E L X chiral chiral 4. Hg 2+ is softer than Zn 2+ . According to the HSAB principle, a hard acid prefers to combine with a hard base, and a soft acid prefers to combine with a soft base. Hg 2+ is a soft acid. So, it can only combine with soft base S 2- . However, Zn 2+ is a borderlines acid, it can combine with sulfides, silicates, carbonates, and oxides. 5. All ligands should be able to coordinate through more than one donor atoms. (a) + (d) have hard donor atoms (O) only. In (b), the terminal S is a soft donor atom while the three terminal O atoms are hard donor atoms. In (c), P is a soft donor atom while N is a hard donor atom. 6. (a) The B-F bond distance is relatively short compared with the Al-Cl bond
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Unformatted text preview: distance. Strong π back donation from F to B which can stabilize the empty p orbital in B. However, because of the longer Al-Cl bond distance, there is less π back donation from Cl to the empty p orbital of Al. Also, Al’s p orbitals are more diffuse, difficult to form π bond. Therefore, the octect rule is achieved through dimerization. (b) B F F F Al Cl Cl Al Cl Cl Cl Cl D 3h D 2h 7. (a) B(OH) 3 (b) H 5 IO 6 (c) [Fe(H 2 O) 6 ] 3+ 8. Oxidation-State Number of valence d electrons Ru 3+ d 5 Co 3+ d 6 Mn 2+ d 5 Rh 1+ d 8 9. NH 2 Fe Cl Cl NH 2 NH 2 NH 2 HN Fe NH 2 Cl HN NH 2 Cl Λ Δ 10. (a) The molecule has 6 such vibration modes (b) + (c) E 1u E 2g A 1g B 1u (d) The A 1g and E 2g normal modes are Raman active while the E 1u normal modes are IR active...
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This note was uploaded on 03/03/2010 for the course CHEM CHEM131 taught by Professor Lin during the Fall '09 term at HKUST.

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HW2_09_ans - distance Strong π back donation from F to B which can stabilize the empty p orbital in B However because of the longer Al-Cl bond

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