Traduceri legalizate

Revin cu cateva precizari despre legalizarea traducerilor. Spuneam ca o traducere legalizata se realizeaza la notar si reprezinta o certificare a traducerii. Serviciul notarial se numeste "legalizarea semnaturii traducatorului". Mai simplu spus, in incheierea de legalizare notarul zice: "da, omul care a semnat si stampilat actul este intr-adevar traducator". Pentru ca notarul sa poata sa certifice acest lucru, traducatorul trebuie sa fie inscris in prealabil la notarul respectiv si sa depuna specimen de semnatura si stampila la acel notar, astfel notarul putand sa confrunte stampila si semnatura de pe documentele ce trebuie legalizate cu cele depuse de catre traducator. Atunci cand se inscrie la un notar si depune specimene de semnatura si stampila, traducatorul trebuie sa depuna si o copie dupa autorizatia de traducator emisa de Ministerul Justitiei.

Tag Team, Back Again

So it's been a while since my last post...I've been spending a lot of time learning the laser lab and reorganizing the ol' disiloxane synthesis project. My biggest problem at the moment is getting my hands on a reliable supply of hydrogen iodide, which we use in turn to make silyl iodide using phenylsilane. Matheson TG has stopped selling it, probably because it wasn't economically sound to offer it. During the synthesis I use, which involves red phosphorus, iodine, and water, unwanted byproducts tend to coat the iodine shards and insulate the valuable inner iodine from reacting. Thus, I decided I'm going to beat the hell out of the iodine, grounding it into a powder with a large surface area (and releasing some stored-up anger in the process).

The alternative to perfecting the syntheses of HI and silyl iodide is making a different halosilane from (pre-bought, hooray!) hydrogen bromide or chloride. The strange thing is, most of the halosilane literature I've looked at used silyl chloride or silyl bromide. Where my advisor got the idea for silyl iodide, I have no idea. Perhaps the disiloxane hydrolysis doesn't work quite as well with bromide or chloride. Yet, hexamethyldisiloxane is made using silyl chloride.

Cloush is in Ohio for a conference this week. When the cat is away, the mice will play... :-D

Gems from UK's Inorganic Lab "Lab Safety" Webpage

That's NOT dry ice! I didn't take the picture, but the caption underneath said that these peroxide crystals "autodetonated shortly after this photo was taken." They formed in an old bottle of ispropyl ether.

The page says something about not letting liquid oxygen condense in a trap, which seems odd to me (anything colder than liquid nitrogen seems too expensive to use in an undergrad lab!). It links to a video showing Purdue students lighting a charcoal grill with a lit cigarette and three gallons of liquid oxygen. If we really are going to possess the cooling power to condense oxygen out of the air in CHE 450G, I commend you University of Kentucky.

EDIT: The boiling point of oxygen is higher than that of nitrogen, so liquid oxygen will condense out of a constant stream of air. My bad!
Oh wow, this is a good one. In the spring of 1997 in advanced organic lab (CHE 533), someone dumped methylene chloride into a waste container containing some icky stuff, including nitric acid. He capped the waste bottle, and a couple of minutes later BAM! Shards of glass and chemicals went flying across the room. Miraculously, no one was injured.

Enter the Matrix

My lab's matrix IR apparatus is almost done, and naturally the guy I'm working with just had to have a baby. In the meantime, I get to watch over it and get things ready for our first target molecule, chlorosilylene. It is the silicon analogue of the one, the only chlorocarbene.

Herzberg was the first to investigate this molecule, having produced it in 1964 by flash photolysis of chlorosilane. As research on CVD intermediates picked up steam, a number of research groups obtained varied results on the extent to which chlorosilylene is produced during CVD. The Clouthier group, of which I am a humble member, revived spectroscopic studies of the radical by performing laser-induced fluoresence experiments on it in 1997. They obtained a whole slew of rotational constants, geometric parameters, and most importantly vibrational frequencies exhibited by the molecule. That's right, a whole slew.

Our goal is to observe HSiCl's ground-state vibrational frequencies directly by jolting trichlorosilane in an electric discharge and performing matrix IR.

Pictures of the apparatus to follow soon!

Bromosilane go BOOM!

Well ladies and gentlemen, I've reached a milestone...I caused my first explosion in lab yesterday. I was cleaning out a flask after a cold-trap separation of the reaction products of the bromosilane synthesis reaction:

PhSiH3 + HBr --> SiH3Br + C6H6

I believed that no bromosilane (or perhaps a negligibly small amount) remained in said flask. I was wrong. Set the flask inside the hood, put a little heat on it to vaporize things, took a step back to walk away, and BAM! A huge, quick flame burst out of the flask's mouth, accompanied by a horrible noise like a gunshot. Incredibly, the flask was just fine, save for a few brown spots that 48% HF took care of right away. Nothing got burned in the hood either. It was just a really loud, scary noise and a few flames. Doesn't mean it didn't scare the pants off me, of course.

The picture, for your viewing pleasure, is the LUMO of bromosilane.