Um, Phantom, as a note, IRL, I'm a Chemist. All I did was check a few facts with an appropriate reference text which sits next to my computer, since it's been a while since I had to teach General Chemistry.
I could have sworn that there was a green copper chelate, but I'll be danged if I can find it. The one I was thinking of was a Ni compound.
As far as Andorians go, I don't even know if the whole cobalt blood thing is screen canon at all. I know it's Lug Canon, so that's why I proposed the tetrahedral cobalt alcohol/organic based blood.
Although, upon further reflection, that may not work, unless the organic fluid used like blood plasma stabilizes the oxygen to carbon dioxide conversion, tetrahedral cobalt doesn't seem like it would have all that much oxygen affinity.
So, it might be better to have a Copper or Iron based system, and have the large amounts of Cobalt be some sort of anti-freeze, or perhaps some sort of alternate oxygen transfer system.
They have a crab like capilary system for the cobalt "blood" and a more usual iron system for internal organs.
Hey if the Klingons can have redundant organs, the Andorians can have redundant oxygen transfer systems.
About the only thing I could come up with for Vulcans (why aren't they black and why do they have green copper blood?) is that we're dealing with some other protein compound, that protects the Vulcan from the light.
Basically, like Andorian blood has anti-freeze properties (cause with no light it's going to be a little cold), Vulcan blood has sunscreen properties.
Whatever this compound is, it protects the Vulcan's skins, and makes their blood green.
I'm a physical chemist, not an organic chemist, so if anyone else has any ideas, I'm open to suggestions.
Alex