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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: nigginz on March 19, 2009, 04:53:41 PM

Title: quantum mechanics- boxs
Post by: nigginz on March 19, 2009, 04:53:41 PM
Hi i am a second year chemistry undergraduate and have a quantum mechanics assignment due in and was wondering if i could have some help on the final question.

Azulene C10H8 is an aromatic hydrocarbon containing delocalised 'pi' elctrons. As a model of this p-electron system, consider the mobile electrons to fit in a rectangular 2-D box of dimensions 5.00 x 4.65 amstrongs

i.) how many pi-electrons does azulene have?
ii.) identify the quantum numbers for the HOMO and LUMO of the of the pi-electron system.
iii) calculate the wavelength (in nm) of the lowest-energy absorption transition.


Grateful for any help you can offer. Thanks.
Title: Re: quantum mechanics- boxs
Post by: FeLiXe on March 22, 2009, 05:54:14 AM
so, which questions can you answer?

i.) count the electrons
ii.) iii.) use the formula for a particle in a 2-dimensional box
Title: Re: quantum mechanics- boxs
Post by: nigginz on March 23, 2009, 06:07:35 AM
That is just one of the 7 questions in the assignment. I could do part i and hazard a guess at ii but i dont really have a clue about iii  :'(
Title: Re: quantum mechanics- boxs
Post by: FeLiXe on March 23, 2009, 01:19:18 PM
the habit on this forum is that you present what you have and then someone tells you if you are correct and helps you out with what you are missing