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FeI centers in iron–sulfide complexes have little precedent in synthetic chemistry despite a growing interest in the possible role of unusually low valent iron in metalloenzymes that feature iron–sulfur clusters. A series of three diiron [(L3Fe)2(μ-S)] complexes that were isolated and characterized in the low-valent oxidation states FeIISFeII, FeIISFeI, and FeISFeI is described. This family of iron sulfides constitutes a unique redox series comprising three nearly isostructural but electronically distinct Fe2(μ-S) species. Combined structural, magnetic, and spectroscopic studies provided strong evidence that the pseudotetrahedral iron centers undergo a transition to low-spin S=1/2 states upon reduction from FeII to FeI. The possibility of accessing low-spin, pseudotetrahedral FeI sites compatible with S2− as a ligand was previously unknown.
A new spin on FeI:FeI centers: A unique series of diiron [(L3Fe)2(μ-S)] complexes were isolated and characterized in the low-valent oxidation states FeIISFeII, FeIISFeI, and FeISFeI as nearly isostructural but electronically distinct species. Structural, magnetic, and spectroscopic studies indicated a transition of the pseudotetrahedral iron centers to low-spin S=1/2 states upon reduction from FeII to FeI (see scheme).
So here’s a thing to never try at home. Derek Muller from the very fine science video blog Veritasium visits with a team of “phsyics and chemistry demonstrators” who built this ridiculous sound board that demonstrates the effect of sound waves traveling through flammable gas. The first half deals mostly with how it works, around 3:38 it turns into pure music and fire.
Humans have been rendered obsolete, at least where the paper airplane is concerned. This machine will fold a plane and launch it, sending it straight into the recycling bin.
Here’s an old Easter one, from 5 years ago.
Happy day-before Thursday which is one day before Friday! Yessss!
Why You Shouldn’t Take Selfies Right Next to a Moving Train
BOOT TO HEAD! LMAO!
Kermit the Frog (Jim Henson) and Fozzie Bear (Frank Oz) hilariously engage in improvised existential banter about their greater state of being during this 1979 camera test for their first “live-action” film, The Muppet Movie.
Kermit: Well Fozzie, the thing of it is though you’re not a real bear. You’re not a real natural bear. I mean, you’re talking about a bear in its natural habitat…What do you have, you have sort of a fake fur. You’ve got foam rubber. You’ve got foam rubber and fake fur. You’re an artificial bear. Have you ever seen a bear with a magenta nose?
Fozzie: I got news for you kid. You have to hurt me, I’m going to have to hurt you. Are you ready for this? Are you ready? You got a wire on your arm. It’s only for movement. I’m sorry, I didn’t mean to hurt you. I believe in you. I do understand that I am not a real bear but I know what I am. I am what I am. But I’m a real puppet. I’m happy with my lot in life.
via Jason Scott