SEO for 301 Redirects for shortened URLs?

So I have a blog attached to my main website that I utilize for SEO harvesting best I can.
The blog is WordPress format that is hosted in a subfolder of my domain.

I’m considering purchasing a secondary URL that is shortened primarily for mobile and microblogging(read: Twitter) user functionality.

The idea is this: is to be 301’d to —->

as you can see, the shorter url is shortened even more by including the blog subfolder.
My question is, will this affect SEO in any appreciable way? Good, bad, neutral?

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