The contest is still open

I have still received no solutions to the $20 question:

What is the literary significance of the complex number (-7/2) + (i(sqrt(445/3))/2)?

As I hope everyone recalls, this number is alluded to in a work by a major literary figure. The prize is a $20 gift card from Destinations Booksellers in New Albany. To claim this prize, you need to post the solution as a comment to this post.

The correct solution must: (1) indicate the author; (2) give the first line of the work; and (3) show how the number is alluded to in the text of the work.

So far, I have given five clues:

(1) The work is in English.
(2) The work appears in the standard editions of the author's complete works.
(3) The author is primarily famous as an author (rather than a scientist or the like).
(4) The work is not a work of science fiction.
(5) The work was written and published between 1850 and 1900.

I will add a sixth clue:

(6) The work is an untitled poem. (Please note that I have revised Requirement 2 for the solution accordingly and am no longer asking for the "title or first line.")

Good luck!