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:

mylongdomain.com/wordpress/seo-article-xyz is to be 301’d to —-> shorturl.com/seo-article-xyz

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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