From the distance is far more than 4.0 Å, considered and Au-π interaction is not expressed
stalk.
Rac-Bi6 having achiral complexes A-Bi6 the asymmetric center in the core region near the flexible chains
are each have the same core part, a slight difference in the flexible chains as molecular structures
only. However, comparing their crystal structure, towards Rac-Bi6 is gold
inter atomic distance is found to be close. In addition all of the complex was crystal structure analysis
in a complex of all-trans-type alkoxy chain is extended to between gold atoms distance is
relatively far away, and having an alkoxy chain is bent structure to it, gold atoms
between each other close trend expressing Oya-kin interaction and was seen. Bent structure
complexes with, all alkoxy chains show an axial orientation relative to the core site
for which was discussed to have This complex is densely be packed.
Then, we were examined CH ••• π interaction acting in each complex. CH ••• π interaction
is the intermolecular interaction acting between the CH bond and π electrons on the alkyl chain and the aromatic ring
is, CH ••• π between distance - each 2.65 2.85 Å (CAlkyl-H •• • π), 2.49 ~ 2.75 Å
(Caryl-H ••• π) to be expressed has been reported at 69. Achiral flexible chain
both CAlkyl-H ••• π interaction gold complex with was not observed, CAryl-H ••• π interaction
was also observed only in the A-Bi6. This is biphenyl skeleton, two types of benzene ring and
has a twisted structure in order to avoid the steric repulsion of the hydrogen bond between the 2,2'-position, minute
anti-bonding of CH bond on the benzene ring between the child trajectory to be because that existed in the appropriate distance
is being estimated. On the other hand, in Rac-Bi6 and S-Nap6 having an asymmetric center at the flexible chain,
CAlkyl-H ••• π interaction is observed, in the case of the Rac-Bi6 further CAryl-H ••• π interaction
It use also found to be expressed at the same time. CAlkyl-H ••• π interactions have been expressed
both is given a complex having a methyl group at the chiral centers, a methyl group is an aromatic ring
when because that could be present in the appropriate position to accommodate the π electrons of thinking. Further
the, Rac-Bi6, as described above, since it is considered that also expressed Oya-kin interaction
between molecules is approached by intermolecular interactions of multiple works, among gold atom closer
is Kiyasuku It was considered to have. In this way, the co by the structure of the flexible chain and core site
collection structure changes in various ways, you also change the number and style of intermolecular interactions along with this
is Rukoto was found.
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