PS1 - R ecommended Reading: 4.1 4.6, 4.8, 1 7.7-17.9 C h...

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± Recommended Reading: 4.1 – 4.6, 4.8, 17.7-17.9 Ch 102 – Problem Set 1 Due: Tuesday, April 5 – Before Class Note that the use of the Symmetrize option in the software is not allowed for the purpose of this problem set. Problem 1 (35 pts) a) Boranes, compounds of boron and hydrogen, can exhibit a variety of structures. One interesting borane form is the dodecaborane dianion, [B 12 H 12 ] 2- , which adopts the structure shown below. = BH 2- Identify the point group of dodecaborane, and using the blank structures below identify the location of the symmetry operations of dodecaborane (you only need to identify one operation of each kind – i.e. only one vertical and one horizontal mirror plane). b) Replacement of two B-H units in the dodecaborane dianion with C-H moieties gives rise to neutral compounds called carboranes, [B 10 C 2 H 12 ]. These complexes are extremely stable, undergoing isomerization at high temperatures (>500°C) with no decomposition. This stability is due to the fact that they can be considered three-dimensional aromatic molecules (following Huckel’s rule). There are three possible carborane isomers, ortho- , meta- , and para- carborane (shown below). Identify the point group of each carborane isomer.
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± = BH = CH ortho meta para
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This note was uploaded on 01/03/2012 for the course CH 102 taught by Professor Hill,m during the Fall '08 term at Caltech.

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PS1 - R ecommended Reading: 4.1 4.6, 4.8, 1 7.7-17.9 C h...

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