Structure of the β-cyclodextrin (β-CD) inclusion complex with p-ethylaniline (PEA)

Abstract

Abstract.(fl-CD. PEA)2.32H20;

The Stability of Cyclodextrin Complexes in Solution

“…A polar group on the guest can protrude from its host to interact with the hydroxy groups on an adjacent CyD, in this way creating a dimeric 2:2 structure that is not necessarily simply two identical 1:1 complexes. Examples of such dimeric 2:2 structures are the β-CyD complexes of 2,5-diiodobenzoic acid, 4-ethylaniline, and ethyl 4-aminobenzoate . Some crystal structures do not seem to be pertinent to the solution state; for example, the 2:1 benzyl alcohol:α-CyD solid complex has one benzyl alcohol inserted in the CyD cavity and the other located in the interstitial space between CyD molecules .…”

Structure of the 4-tert-butylbenzyl alcohol–β-cyclodextrin complex. Common features in the geometry of β-cyclodextrin dimeric complexes

“…Exceptions are (a) the 3,3-dimethylbutylamine (Mavridis, Hadjoudis & Tsoucaris, 1990a) and the p-ethylaniline (Tokuoka, Fujiwara & Tomita, 1981) fl-CD complexes where the amine group forming a hydrogen bond to a water molecule is found at the dimeric interface and (b) the SFEN and the racemic FENO where the guests are oriented head-to-tail and the hydrophilic group of only one guest molecule protrudes from the region of the primary hydroxyl groups, while the other is found in the dimeric interface.…”

“…the salicylic acid molecule trapped in the interface does not form hydrogen bonds with the fl-CD secondary hydroxyl groups. In several complexes such as those of benzocaine (Hamilton & Sabesan, 1982a), METH, p-ethylaniline (Tokuoka, Fujiwara & Tomita, 1981) and 3,3-dimethylbutylamine (Mavridis, Hadjoudis & Tsoucaris, 1990a), the polar groups found in that area are not hydrogen bonded to the secondary hydroxyl groups but to a water molecule trapped inside the cavity.…”

Ανάλυση Της Κρυσταλλικής Δομής Προϊόντων Εγκλεισμού

“…(Giordano et al, 2001). Κατά την έρευνα της βιβλιογραφίας εντοπίστηκαν λίγα β-CD σύμπλοκα διμερών με μόρια νερού μέσα στο εσωτερικό της κοιλότητας του διμερούς όπως στην περίπτωση του ξενιζόμενου μορίου π-αιθυλοανιλίνη (Tokuoka et al, 1981), της βενζοκαΐνης (Hamilton & Sabesan, 1982), της (R-)(-)-Fenoprofen (Hamilton & Chen, 1988), της 3,3-διμεθυλοβουτυλαμίνης (Mavridis, et al, 1991 [51] Η μετατόπιση των διαδοχικών διμερών του ίδιου καναλιού είναι 2.27 Å.…”