Phosphorus donor-crown ether hybrid ligands as a route to carbonyl activation: phosphorus substituent effects and the importance of strong cation binding

1983 ◽  
Vol 105 (4) ◽  
pp. 1064-1065 ◽  
Author(s):  
John Powell ◽  
Michael Gregg ◽  
Anda Kuksis ◽  
Patty Meindl
Keyword(s):  
Crown Ether ◽  
Substituent Effects ◽  
Cation Binding ◽  
Hybrid Ligands

Electrochemiluminescence of Ruthenium(II) Complexes Functionalized with Crown Ether Pendants and Effects of Cation Binding

2008 ◽  
Vol 47 (3) ◽  
pp. 1218-1223 ◽  
Author(s):  
Mei-Jin Li ◽  
Zuofeng Chen ◽  
Nianyong Zhu ◽  
Vivian Wing-Wah Yam ◽  
Yanbing Zu
Keyword(s):  
Crown Ether ◽  
Cation Binding

Cation binding properties of polyanions bearing fluorescent crown ether units

1995 ◽  
Vol 31 (6) ◽  
pp. 559-563 ◽  
Author(s):  
Masamitsu Shirai ◽  
Yoshiki Matoba ◽  
Masahiro Tsunooka
Keyword(s):  
Crown Ether ◽  
Cation Binding ◽  
Binding Properties

Syntheses and thermal properties of new liquid crystals bearing a crown ether ring: cation binding in the nematic phase

1990 ◽  
Vol 55 (2) ◽  
pp. 541-548 ◽  
Author(s):  
Gong Xin He ◽  
Fumio Wada ◽  
Kiyoshi Kikukawa ◽  
Seiji Shinkai ◽  
Tsutomu Matsuda
Keyword(s):  
Thermal Properties ◽  
Liquid Crystals ◽  
Crown Ether ◽  
Nematic Phase ◽  
Cation Binding

Solid-state chemistry of polycarboxylate crown ether cation complexes: cooperative binding of water and metal ions by flexible chorands

1993 ◽  
Vol 71 (2) ◽  
pp. 239-253 ◽  
Author(s):  
Philip J. Dutton ◽  
Thomas M. Fyles ◽  
Valia Veettil Suresh ◽  
Frank R. Fronczek ◽  
Richard D. Gandour
Keyword(s):  
Solid State ◽  
Crown Ether ◽  
Sodium Salt ◽  
Metal Salt ◽  
Alkali Metal Salt ◽  
Cation Binding ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Cesium Salt

The solid-state structures of alkali-metal salt complexes of crown ether tetra- and hexa-carboxylic acids (18C6A4 and 18C6A6) have been determined. The sodium salt of 18C6A6 crystallizes as the trihydrate in orthorhombic space group P212121 (a = 7.6868(12), b = 15.429(3), c = 21.975(2) Å, R = 0.031 for 5192 observed data); the potassium salt of 18C6A6 crystallizes as the the trihydrate in orthorhombic space group P212121 (a = 7.6711(8), b = 15.709(2), c = 21.966(5) Å, R = 0.035 for 2521 observed data); the thallium(I) salt of 18C6A6 crystallizes as the dihydrate in orthorhombic space group P212121 (a = 12.0331(10), b = 12.4333(12), c = 17.366(2) Å, R = 0.035 for 4952 observed data); and the cesium salt of 18C6A6 crystallizes as the dihydrate in monoclinic space group P21 (a = 7.708(3), b = 13.492(2), c = 11.9501(9) Å, β = 94.49(2)°, R = 0.029 for 4480 observed data). The sodium salt of 18C6A4 crystallizes as the dihydrate in monoclinic space group P21 (a = 11.4368(11), b = 7.7068(11), c = 12.6579(12) Å, β = 98.515(8)°, R = 0.035 for 3000 observed data); the thallium(I) salt of 18C6A4 crystallizes as the dihydrate in monoclinic space group P21(a = 11.719(2), b = 7.668(2), c = 12.8403(13) Å, β = 99.052(9)°, R = 0.040 for 3981 observed data); and the cesium salt of 18C6A4 crystallizes as the dihydrate in monoclinic space group P21 (a = 11.787(2), b = 7.637(2), c = 13.001(2) Å, β = 98.705(12)°, R = 0.038 for 3428 observed data). Both chorands exhibit a cooperative relationship of mean cavity radius and guest-ion radius, which closely follows the effective ionic radii of the guests. The hexaacid is a preorganized host for monohydrated cations. It provides a trigonal hydrogen bonding receptor site for the water molecule, and up to nine oxygen donors for cation binding. Guests ranging in size from Na+ to Cs+ are accommodated without distortion of the macrocyclic framework. The tetraacid is similarly tolerant of a range of guests, but greater structural reorganization of the ligand is required to optimize contacts with fully dehydrated cations. Skeletal drawings of donor atoms, in conjunction with polar coordinate maps of torsion angles, reveal how the demands of the guest are accommodated by the host.

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