The Awful Chemical Language Continued

Back here somewhere I commented that new chemical terms were relatively rare -- infrequent enough to keep up with them. Well here's a new one: "agostomer."  Classics scholars and word lovers should like the origin of this new word.

The word agostic was coined about 30 years or so ago to describe how certain two-point bonding occurs. The Greek word agostos (ἀγοστός) means the "flat of the hand" and is apparently very rare and only occurs once in Homer's Iliad (it took me some doing to find that Greek link). The metaphor is that the bonding resembles a man's bent arm with the flat of one hand on a hip such that there are two points of arm attachment to the body: a strong one at the shoulder and a weaker one between the hand and the hip.

Recently, an old friend of mine co-discovered and reported on a remarkable new compound which crystallized in two subtly different ways, one analogous to having the palm on the hip and the other with the back of the hand on the hip. The two isomers are termed "agostomers" and also show the  interesting property that one agostomer crystal is orange and the other one is blue. Here's a depiction:

Molybdenum Fixes Nitrogen

Molybdenum's odd-sounding name comes from its resemblance to lead ores. That makes three elements: plumbum (lead), carbon (plumbago), and now molybdenum named after lead. Perhaps it's not so much the color as the texture:

Native ore: MoS₂

Native plumbago (graphite)

Native lead (Galena, PbS)

Molybdenum's role in life is anything but leaden. Mo is in nitrogenase, an enzyme absolutely essential for life. Nitrogenase-containing bacteria "fix" nitrogen, turning thin air into solid plant food (ammonium), a feat no less remarkable than photosynthesis. The bacteria in turn get first dibs on the sugars made by the plants in perfect symbiosis.

If artificial photosynthesis is cool--making sugars and fuels from CO₂--nitrogen fixation is even more exciting because we're about a third of the way there.*  Bacteria make about 2/3 of the world's fixed nitrogen, and the ancient Haber-Bosch process does the rest.  The Haber-Bosch process, first developed in 1913, enabled Germany to fight the First World War. Today it helps feed about a third of the world's population but it also consumes about 1-2 % of the world's annual energy supply. We can do even better, perhaps by learning from nature.

Nitrogenase manages to fix nitrogen under much milder conditions than Haber-Bosch, though like many natural processes, the yield is diffuse and unusable industrially. Molybdenum's connection to nitrogen fixation was first noted in 1930 when bacteria raised on ammonia showed no need for the element while those raised on nitrogen did (before the enzyme nitrogenase had even been identified). When nitrogenase was found, the next step was to crystallize it and determine its structure. This happened in 1992, at a time when molybdenum and the heavier tungsten were already famous for loosely binding things like H₂ and N₂ in synthetic tungsten compounds. Some thought perhaps nature had gotten there first. Alas, the structure gave few clues as to where and how nitrogen is activated, except that it happened stepwise, using protons and electrons instead of H₂.

Another really cool thing about the nitrogenase X-ray crystal structure was the revelation of a mystery element "X" which could be either a C, an N, or an O atom. Several contact points surround the mystery element X which makes that a "Texas" atom.  More recent work, published last year in Science, says it is carbon (link). More on that later.
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*There are vanadium-dependent nitrogenases which convert CO to alkanes--just like Fischer-Tropsch catalysts do: link  That would be so cool if the X-factor were a Texas carbide.