2012년 11월 24일 토요일
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2012년 11월 12일 월요일
AlCl3 a lewis acid
The main reason that AlCl3 can occupy a 4th chloride ligand is because
the resulting species: R-Cl-AlCl3 (with a + formal charge on the Cl atom
of the alkyl chloride, and a - formal charge on the Al atom) is
tetrahedral about the Al atom. Tetrahedral aluminum complexes (such as
AlCl4-) are very well known chemical species, however, trigonal planar
aluminum species with a bond order of 4 (such as the case with AlCl3
with a lone-pair of electrons on one of the Cl atoms back-bonded into
the empty p-orbital of the Al atom) are not known. The same is also
observed for boron. Tetrahedral anionic aluminate or borate species are
known, while trigonal planar species with bond order 4 are not.
2012년 11월 8일 목요일
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