Bloomstrand Jorgenson Chain Theory
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| Bloomstrand Jorgenson Chain Theory |
Bonding of transition
metal completes was explained by different theories at the end of 18th century.
Bloomstrand Jorgenson chain theory was presented by Bloomstrand and developed
by Jorgensen. Very Few completes like cobalt compounds were discovered at that
time. Their behavior was discovered by this theory.
AgNO3 is a very
good reagent to detect Cl- ions in a solution. According
to Bloomstrand, complexes made long chains due to connection with ligands thus,
it was called chain Theory. By the above reactions silver chloride precipitates
are made (milky color). 3AgCl means 3 Cl- ions are present in free form.
Bloomstrand Idea:
Like methylene groups,
amine groups due also connected in chains.
-CH2-CH2-CH2-CH2-
-NH2- NH2—NH2-
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The chloride ions attached
with metals are non-ionizable. The chloride ions attached with metals amines
are ionizable.
i) All the three chlorides
are ionizable and chlorination will give 3AgCl.
ii) 1-chloride is not
ionizable because attached to Co (metal). Chlorination will give 2AgCl.
iii) Only
one chloride is ionizable. The product of chlorination is AgCl. Cl attached to amine depends upon
oxidation state of metal.
Draw back
This theory was unable to explain how NH3 amines are
attached with each other when their orbitals are filled.
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Applications Of Valence Bond Theory (VBT)
Chemistry of coordination compounds/ Introduction
