10.1021/la9907376.s001
Gopal Das
Gopal
Das
Parimal K. Bharadwaj
Parimal K.
Bharadwaj
U. Singh
U.
Singh
R. A. Singh
R. A.
Singh
Ray J. Butcher
Ray J.
Butcher
A Comparative Study of Cryptand-Based (Triple-Head and
Triple-Tail) Amphiphiles at the Air−Water Interface
American Chemical Society
1999
alkyl chain lengths
wf
interface
space group P 31 c
amphiphile L 5 crystallizes
amphiphile L 6 crystallizes
GOF
cryptand headgroup
Langmuir
1999-12-23 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/A_Comparative_Study_of_Cryptand-Based_Triple-Head_and_Triple-Tail_Amphiphiles_at_the_Air_Water_Interface/3730452
Two cryptands have been derivatized by reacting with acid chlorides of different alkyl chain lengths
(between C<sub>4</sub> and C<sub>18</sub>) to get a set of cryptand-based (triple-head and triple-tail) neutral amphiphiles. The
cavity of either cryptand headgroup can accommodate a first-row transition metal ion forming stable
cryptates. The free as well as the Cu(II)-complexed amphiphiles are studied at the air−water interface
in a Langmuir−Blodgett trough. They form stable monolayers at the air−water interface, which can be
transferred onto different substrates (viz., glass, fluorite, and quartz). They form Y-type Langmuir−Blodgett films. The amphiphile <b>L</b><b><sub>5</sub></b> crystallizes in the monoclinic space group <i>P</i>2<sub>1</sub>/<i>c</i> with <i>a</i> = 10.091(3) Å,
<i>b</i> = 29.994(8) Å, <i>c</i> = 18.174(5) Å, <i>Z</i> = 4, <i>R</i><sub>f</sub> = 0.1048, <i>R</i><sub>wf</sub> = 0.2660, and GOF = 0.925. The amphiphile <b>L</b><b><sub>6</sub></b>
crystallizes in the trigonal space group <i>P</i>31<i>c</i> with <i>a</i> = 15.118(2) Å, <i>b</i> = 15.118(2) Å, <i>c</i> = 11.734(2) Å, <i>Z</i> =
2, <i>R</i><sub>f</sub> = 0.033, <i>R</i><sub>wf</sub> = 0.062, and GOF = 0.813. The solid-state structures of both the amphiphiles show a
3-fold symmetry about a point in the center of the cryptand headgroup. The hydrophobic tails of the
cryptands are packed in the lattice both in interdigitizing and in noninterdigitizing manners.