scholarly journals Complexation of molecular clips containing fragments of diphenylglycoluril and benzocrown ethers with paraquat and its derivatives

2017 ◽  
Vol 13 ◽  
pp. 2056-2067 ◽  
Author(s):  
Leonid S Kikot' ◽  
Catherine Yu Kulygina ◽  
Alexander Yu Lyapunov ◽  
Svetlana V Shishkina ◽  
Roman I Zubatyuk ◽  
...  
Keyword(s):  
Solid State ◽  
Crown Ether ◽  
Ring Size ◽  
Benzocrown Ethers ◽  
Molecular Clips

The complexation of molecular clips containing fragments of diphenylglycoluril and benzocrown ethers with paraquat and its derivatives has been studied both in solution and in the solid state. In this paper we studied the influence of the crown ether ring size and the nature of the substituents at the nitrogen atoms of the paraquat derivatives on the composition and stability of these complexes.

Solid state stereochemistry of crown ethers: X-ray crystal structure and 13C NMR studies of the LiNCS complex of 1,4,7,11-tetraoxacyclotetradecane

2000 ◽  
Vol 78 (3) ◽  
pp. 316-321
Author(s):  
G W Buchanan ◽  
A B Driega ◽  
G PA Yap
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Crown Ether ◽  
13C Nmr ◽  
Title Complex ◽  
Nmr Studies ◽  
Nmr Spectrum ◽  
X Ray ◽  
Large Amplitude Motion ◽  
C Nmr

The title complex is asymmetric in the crystal due to the spatial orientation of the NCS function. The space group has been determined to be P21 with a = 9.496(3), b = 8.736(3), c = 9.676(3) Å, β = 117.859(5)°, and Z = 2. The solid state 13C NMR spectrum is consistent with the lack of symmetry in the crystal and there is little evidence for large amplitude motion in the macrocycle as determined from the dipolar dephased spectrum.Key words: macrocyclic crown ether, lithium complex.

scholarly journals Solid state transformation of crown ether uranyl nitrate and peroxide crystals in the presence of light

2020 ◽  
Author(s):  
Anamar Blanes ◽  
Tori Forbes ◽  
Allison Peroutka ◽  
Madeline Basile ◽  
Erica Cole
Keyword(s):  
Solid State ◽  
Crown Ether ◽  
Uranyl Nitrate ◽  
State Transformation ◽  
Solid State Transformation

A Solid-State Supramolecular Rotator Assembled from a Cs-crown Ether Polyoxometalate Hybrid: (Cs+)3([18]crown-6)3(H+)2[PMo12O40]

2008 ◽  
Vol 8 (3) ◽  
pp. 812-816 ◽  
Author(s):  
Tomoyuki Akutagawa ◽  
Daigoro Endo ◽  
Fumito Kudo ◽  
Shin-ichiro Noro ◽  
Sadamu Takeda ◽  
...  
Keyword(s):  
Solid State ◽  
Crown Ether

Synthesis, X-ray crystal structure, and solid-state 13C NMR study of tris(9-crown-3)triphenylene

2001 ◽  
Vol 79 (2) ◽  
pp. 195-200 ◽  
Author(s):  
Gerald W Buchanan ◽  
Majid F Rastegar ◽  
Glenn PA Yap
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Crown Ether ◽  
Chemical Shifts ◽  
Aromatic Rings ◽  
X Ray ◽  
Nmr Study ◽  
Group A ◽  
C Nmr ◽  
Solid State 13C Nmr

Benzo-9-crown-3 ether trimerizes in the presence of FeCl3 and aqueous H2SO4 to produce tris(9-crown-3)triphenylene in 25.4% yield. This compound crystallizes in the monoclinic P21/c space group: a = 13.759(2) Å, b = 13.318(2) Å, c = 13.399(2) Å, β = 96.883(2)°, with Z = 4. The three 9-crown-3 ether units of the trimer possess different geometries and there is substantial deviation from coplanarity in the three aromatic rings. 13C NMR chemical shifts in the solid state are consistent with this lack of symmetry and are discussed in terms of the X-ray crystal-structure data.Key words: crown ether, trimerization, stereochemistry.

Poly(crown ether): a potential candidate for solid-state electrolytes

1989 ◽  
Vol 22 (6) ◽  
pp. 2845-2849 ◽  
Author(s):  
Darmasena Peramunage ◽  
Jack E. Fernandez ◽  
L. H. Garcia-Rubio
Keyword(s):  
Solid State ◽  
Crown Ether ◽  
Potential Candidate ◽  
Solid State Electrolytes

scholarly journals Crown ether alkali metal TCNQ complexes revisited – the impact of smaller cation complexes on their solid-state architecture and properties

CrystEngComm ◽  
2019 ◽  
Vol 21 (21) ◽  
pp. 3273-3279 ◽  
Author(s):  
Bingjia Yan ◽  
Peter N. Horton ◽  
Andrea E. Russell ◽  
Christopher J. Wedge ◽  
Simon C. Weston ◽  
...  
Keyword(s):  
Solid State ◽  
Crown Ether ◽  
Alkali Metal ◽  
Water Molecules ◽  
The Impact ◽  
Cation Complexes

Water molecules play a key structure-organising role in the crystallisation of 15-crown-5 complexes of lithium and sodium TCNQ in the presence of excess TCNQ0.

Tactic poly(crown ether)s with pendant benzocrown ethers

1979 ◽  
Vol 1 (6) ◽  
pp. 403-407 ◽  
Author(s):  
Keiichi Kimura ◽  
Hiroshi Tamura ◽  
Takumi Maeda ◽  
Toshiyuki Shono
Keyword(s):  
Crown Ether ◽  
Benzocrown Ethers

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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