hydrochloric After the first part of the cycle, consisting of iron salts, it's time for the next group of salt. Sponsor of today's post is COCl 2 ;)
At the beginning of the second semester of the academic year 2009/2010 it was my longed-for moment - The first classes for students! These classes were exercises in the laboratory of inorganic chemistry, in my case, conducted for students with specialization biological chemistry. The question of the conduct of unconventional mgra Davidoffskiego, specific questions and concerns will be built even under consideration here on the blog, so I leave these matters for later;) The important thing now is the fact that one of the exercises that I was able to conduct related to cobalt compounds. Preparing a comprehensive classes discovered many interesting news on the cobalt salt alone (not to mention nothing of other compounds, of which "struggled" with a smile on my students;). Thus the merits;)
chose cobalt chloride (II), because this compound probably has the greatest number of impressions;) Anhydrous COCl 2 obtained in direct reaction of metallic cobalt with chlorine. This is a solid blue color, the host structure CdCl 2 . COCl 2 easily absorbs moisture from the air, forming a pale pink hydrates.
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| trans - [COCl 2 (H 2 O) 4 ] |
Crystalline COCl 2 × 6H 2 About includes units trans - [COCl 2 (H 2 O) 4 ] which are connected with other water molecules through a network of hydrogen bonds. The COCl 2 × 4H 2 About is composed of molecules connected by hydrogen bonds cis - [COCl 2 (H 2 O) 4 ] .
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| cis - [COCl 2 (H 2 O) 4 ] |
last in the queue hydrate COCl 2 × 2H 2 About have different structure - it consists of interconnected walls oktaedrów:
real fun chloride, cobalt (II) gets going in earnest in aqueous solution. Key individuals are [Co (H 2 O) 6 ] 2 + , [COCl (H 2 O) 5 ] + and [COCl 4 ] 2 - , and accompany them in smaller quantities [COCl 2 (H 2 O) 4 ] and [COCl 3 (H 2 O) 2 ] - .
[COCl 4 ] 2 - is an anion complex of blue color. Arises when the solution containing akwajon cobalt (II) is added concentrated hydrochloric acid. Interestingly, you can also occasionally get this ion, by heating the solution COCl 2 is observed when a very nice color change from pink to blue;) In the COCl 2 also worth to note that this salt forms adducts with tetrahedral structure, the type of COCl 2 × 2L , with neutral donors. Interestingly, these donors in the presence of these adducts are reduced by creating derivatives of general formula COCl × L 3 , eg COCl (PR 3 ) 3 . These compounds can be further modified to allow to obtain the whole range of other combinations of cobalt - both inorganic and organometallic compounds. The reaction with ammonia [Co (H 2 O) 6 ] 2 + gives aminakompleks [Co (NH 3 ) 6 ] 2 + that quite easily oxidized to [Co (NH 3 ) 6 ] 3 + .
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