Syntheses and crystal structures of seven alicyclic diols which crystallise with layer structures instead of the helical tubuland inclusion lattice

1990 ◽  
pp. 855 ◽  
Author(s):  
Stephen C. Hawkins ◽  
Marcia L. Scudder ◽  
Donald C. Craig ◽  
A. David Rae ◽  
Razman B. Abdul Raof ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Layer Structures

Syntheses, crystal structures, and luminescent properties of three zinc carboxyphosphonates with 2D layered and 3D pillared-layer structures

2015 ◽  
Vol 429 ◽  
pp. 252-256 ◽  
Author(s):  
Hai-Qing Li ◽  
Peng Wang ◽  
Yun-Sheng Ma ◽  
Hong-Jian Cheng ◽  
Xiao-Yan Tang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Luminescent Properties ◽  
Layer Structures

scholarly journals Push–pull quinoidal porphyrins

2018 ◽  
Vol 16 (19) ◽  
pp. 3648-3654 ◽  
Author(s):  
Martin J. Smith ◽  
Iain M. Blake ◽  
William Clegg ◽  
Harry L. Anderson
Keyword(s):  
Crystal Structures ◽  
Significant Contribution ◽  
Layer Structures

Quinoidal porphyrins with electron-donating 1,3-dithiolane and electron-withdrawing dicyanomethylene groups form tightly π-stacked layer structures, despite their curved geometries and bulky aryl substituents. The crystal structures of these quinoidal porphyrins indicate that there is no significant contribution from singlet biradical or zwitterionic resonance forms.

Crystal Structures of Seven Terephthaldiamide Derivatives

2002 ◽  
Vol 57 (8) ◽  
pp. 914-921 ◽  
Author(s):  
P. G. Jones ◽  
J. Ossowski ◽  
P. Kus
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Layer Structure ◽  
Inversion Symmetry ◽  
Asymmetric Unit ◽  
X Ray ◽  
Layer Structures ◽  
Structure Determinations ◽  
Independent Molecules

N,N′-Dibutyl-terephthaldiamide (1), N,N′-dihexyl-terephthaldiamide (2), N,N′-di(tert-butyl)- terephthaldiamide (3), N,N,N′,N′-tetrabutyl-terephthaldiamide (4), 1,1′-terephthaloylbis- pyrrolidine (5), 1,1′-terephthaloyl-bis-piperidine (6), and 4,4′-terephthaloyl-bis-morpholine (7) have been synthesised and physicochemically characterised. The X-ray structure determinations reveal imposed inversion symmetry for compounds 1-6; compound 3 has two independent molecules with inversion symmetry in the asymmetric unit. Compounds 1-3 form classical hydrogen bonds of the type N-H···O=C, leading to a ribbon-like arrangement of molecules (1 and 2) or a layer structure (3). Compound 3 also displays a very short C-H···O interaction, a type of hydrogen bond that is also observed in compounds 4-7, which lack classical donors; thereby compounds 4-6 form layer structures and 7 a complex threedimensional network.

scholarly journals Soft 2D Layer Porous Coordination Polymers with 1,2-Di(4-pyridyl)ethane

2013 ◽  
Vol 66 (4) ◽  
pp. 464 ◽  
Author(s):  
Keisuke Kishida ◽  
Satoshi Horike ◽  
Kanokwan Kongpatpanich ◽  
Susumu Kitagawa
Keyword(s):  
Coordination Polymer ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Porous Structures ◽  
Porous Coordination Polymers ◽  
Substituent Group ◽  
Layer Structures ◽  
Porous Coordination Polymer

Porous coordination polymer compounds consisting of Zn2+, 1,2-di(4-pyridyl)ethane, and dicarboxylates were synthesised and their crystal structures were determined. These are doubly interpenetrated 2D layer structures, and the flexibility of porous structures is dependent on the substituent group of the dicarboxylate. From gas adsorption studies, distinct adsorption isotherms were observed for CO2, CH4, C2H4, and C2H6 at 195 K and 273 K, respectively.

Single-layer structures of a100- and b010-Gallenene: a tight-binding approach

2019 ◽  
Vol 21 (28) ◽  
pp. 15798-15804 ◽  
Author(s):  
M. Nakhaee ◽  
M. Yagmurcukardes ◽  
S. A. Ketabi ◽  
F. M. Peeters
Keyword(s):  
Ab Initio ◽  
Linear Combination ◽  
Crystal Structures ◽  
Tight Binding ◽  
Single Layer ◽  
Atomic Orbitals ◽  
Layer Structures

Using the simplified linear combination of atomic orbitals (LCAO) method in combination with ab initio calculations, we construct a tight-binding (TB) model for two different crystal structures of monolayer gallium: a100- and b010-Gallenene.

In2.24(NCN)3 and NaIn(NCN)2: Synthesis and Crystal Structures of New Main Group Metal Cyanamides

1995 ◽  
Vol 50 (8) ◽  
pp. 1245-1251 ◽  
Author(s):  
Richard Dronskowski
Keyword(s):  
Crystal Structures ◽  
Structural Model ◽  
Point Group ◽  
Chemical Transport ◽  
Group Symmetry ◽  
Experimental Accuracy ◽  
X Ray ◽  
Main Group Metal ◽  
Layer Structures ◽  
Structure Determinations

Single crystals of In2.24(NCN)3 and NaIn(N CN)2 can be synthesized from a reaction between InBr and NaCN at 400 °C, followed by chemical transport at 400-500 °C. The X-ray crystal structure determinations of In2.24(NCN)3 (rhombohedral R3̄c, a = 606.09(4), c = 2884.4(2) pm, Z = 6) and NaIn(NCN)2 (orthorhombic Cmcm, a = 961.30(6), b = 716.84(5), c = 603.65(4) pm, Z = 4) reveal ionic layer structures built from sheets of cationic and anionic (cyanamide) motifs. While NaIn(NCN)2 contains In3+ and Na+ ions, In2.24(NCN)3 is a mixedvalence compound, incorporating a monovalent In+ ion besides trivalent indium. The NCN2- units of both In2.24(NCN)3 and NaIn(NCN)2 reflect perfect D∞h point group symmetry within the limits of experimental accuracy. Furthermore, an evaluation of all presently available crystallographic data on metal cyanamide crystal structures manifests that there is no evidence for a non-centrosymmetric description of any of these. Likewise, we propose an alternative centrosymmetric structural model for lead cyanamide, PbNCN, and question the evidence of the unsymmetrical, non-D∞h shaped cyanamide anion in the latter structure.

Coordination Chemistry of Lipoic Acid and Related Compounds, Part 1 Syntheses and Crystal Structures of the UV- and Light-Sensitive Lipoato Complexes [M(lip)2(H2O)2] (M = Zn, Cd)

1997 ◽  
Vol 52 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Henry Strasdeit ◽  
Angelika von Döllen ◽  
Anne-Kathrin Duhme
Keyword(s):  
Coordination Chemistry ◽  
Crystal Structures ◽  
Metal Nitrate ◽  
X Ray Diffraction ◽  
Carboxylate Ligands ◽  
X Ray ◽  
Layer Structures ◽  
Network Of Hydrogen Bonds ◽  
Related Compounds ◽  
Nm Range

The rac-lipoato (lip-) complexes [Zn(lip)2(H2O)2] (1) and [Cd(lip)2(H2O)2] (2) were obtained in good yields from solutions of sodium lipoate and the respective metal nitrate in methanol/water. 1 and 2 form pale yellow, moderately light-sensitive crystals.Both compounds were structurally characterized by single-crystal X-ray diffraction. 1: C2/c, a = 39.958(6), b = 5.360(1), c = 10.794(1) Å, β = 95.76(1)°, Z = 4, wR2 = 0.150 (all data). 2: C2/c, a = 38.200(2), b = 5.472(1), c = 11.179(1) Å, β = 92.72(1)°, Z = 4, wR2 = 0.090 (all data). The metal ions are hexacoordinated by the oxygen atoms of two chelating carboxylate ligands and two aqua ligands. The crystal structures are very similar but not isotypic. They are layer structures, in which the complexes within a layer are interconnected by a network of hydrogen bonds. Adjacent layers have contacts via the 1,2-dithiolanyl rings of their lipoato ligands.Crystals of 1 and 2 decompose on exposure to visible light or ultraviolet radiation in the 280-390 nm range. Photopolymerization by formation of intermolecular S-S bonds is very probably involved. Furthermore, the infrared spectra reveal the transformation of COO- into COOH groups

Sign in / Sign up

Export Citation Format

Share Document