Building layered structures from hydrogen bonded molecular units and 1D metal phosphonate chains: synthesis, characterization and crystal structures of N,N′-dimethyl-N,N′-ethylenediamine-bis(methylenephosphonic acid), its Ni(ii) and Pb(ii) complexes

2002 ◽  
pp. 4541-4546 ◽  
Author(s):  
Jiang-Gao Mao ◽  
Zhike Wang ◽  
Abraham Clearfield
Keyword(s):  
Crystal Structures ◽  
Layered Structures ◽  
Metal Phosphonate ◽  
Hydrogen Bonded

scholarly journals Structures of piperazine, piperidine and morpholine

2004 ◽  
Vol 60 (2) ◽  
pp. 219-227 ◽  
Author(s):  
Andrew Parkin ◽  
Iain D. H. Oswald ◽  
Simon Parsons
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Structures ◽  
Layered Structures ◽  
Hexagonal Close Packed ◽  
Hydrogen Bonded

The crystal structures of piperazine, piperidine and morpholine have been determined at 150 K. All three structures are characterized by the formation of NH...N hydrogen-bonded chains. In piperazine these are linked to form sheets, but the chains are shifted so that the molecules interleave. In morpholine there are in addition weak CH...O interactions. Topological analyses show that these three structures are closely related to that of cyclohexane-II, which can be described in terms of a pseudo-cubic close-packed array of molecules in a familiar ABC layered arrangement. While the positions of the molecules within each layer are similar, hydrogen bonding occurs between the ABC layers and in order to accommodate this the molecules are rotated relative to those in cyclohexane-II. Piperidine and morpholine also adopt layered structures, with hydrogen-bonding or CH...O interactions between the layers. In these cases, however, the layering more resembles a hexagonal close-packed arrangement.

Crystal Structures and Magnetic Properties of Hydrogen-Bonded Nitronyl Nitroxide Radicals and Their Metal Complexes

2002 ◽  
Vol 379 (1) ◽  
pp. 153-158 ◽  
Author(s):  
Mikio Ueda ◽  
Tomoyuki Mochida ◽  
Sachie Furukawa ◽  
Hideaki Suzuki ◽  
Hirosi Moriyama ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Nitronyl Nitroxide ◽  
Nitroxide Radicals ◽  
Hydrogen Bonded

Synthesis and X-ray crystal structures of dinuclear hydrogen-bonded cadmium and lead 2-aminoethanethiolates

Polyhedron ◽  
2005 ◽  
Vol 24 (8) ◽  
pp. 865-871 ◽  
Author(s):  
Mohan S. Bharara ◽  
Chong H. Kim ◽  
Sean Parkin ◽  
David A. Atwood
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Cadmium And Lead ◽  
Hydrogen Bonded

Metal Phenoxyalkanoic Acid Interactions. XXV. The Crystal Structures of (2-Formyl-6-Methoxyphenoxy)Acetic Acid and Its Zinc(II) Complex and the Lithium, Zinc(II) and Cadmium(II) Complexes of (2-Chlorophenoxy)Acetic Acid

1987 ◽  
Vol 40 (7) ◽  
pp. 1147 ◽  
Author(s):  
EJ Oreilly ◽  
G Smith ◽  
CHL Kennard ◽  
TCW Mak
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Free Acid ◽  
Rotational Symmetry ◽  
Carboxyl Groups ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
Planar Complex ◽  
Hydrogen Bonded

The crystal structures of (2-formyl-6-methoxyphenoxy)acetic acid (1), diaquabis [(2-formyl-6-methoxyphenoxy) acetato ]zinc(11) (2), tetraaquabis [(2-chlorophenoxy) acetato ]zinc(11) (3), triaquabis [(2-chlorophenoxy) acetato ]cadmium(11) dihydrate (4) and lithium (2-chloro- phenoxy )acetate 1.5 hydrate (5) have been determined by X-ray diffraction. The acid (1) forms centrosymmetric hydrogen-bonded cyclic dimers [O…0, 2.677(6) �] which are non-planar. Complex (2) is six-coordinate with two waters [Zn- Ow , 1.997(2) �] and four oxygens from two asymmetric bidentate carboxyl groups [Zn-O, 2.073, 2.381(2) �] completing a skew trapezoidal bipyramidal stereochemistry. Complex (5) is also six-coordinate but is octahedral, with two trans-related unidentate carboxyl oxygens [mean Zn-O, 2.134(9) �] and four waters [mean Zn-O, 2.081(9) �]. The seven-coordinate complex (4) has crystallographic twofold rotational symmetry relating two :symmetric bidentate acid ligands [ Cd -O, 2.26, 2 48(:) �] and two waters [ Cd -O, 2.34(2) �] while the third water lies on this axis [ Cd -O, 2.27(2) �]. In contrast to the monomers (2)-(4), complex (5) is polymeric with tetrahedral lithium coordinated to one water and three carboxylate oxygens [mean Li-0, 1.95(1) �]. The essential conformation of the free acid is retained in complexes (2), (3) and (4) but in (5), it is considerably changed.

scholarly journals Unusual co-crystal of isonicotinamide: the structural landscape in crystal engineering

2012 ◽  
Vol 370 (1969) ◽  
pp. 2900-2915 ◽  
Author(s):  
Srinu Tothadi ◽  
Gautam R. Desiraju
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Crystal Engineering ◽  
Organic Molecule ◽  
Reference Molecule ◽  
Hydrogen Bonded

The idea of a structural landscape is based on the fact that a large number of crystal structures can be associated with a particular organic molecule. Taken together, all these structures constitute the landscape. The landscape includes polymorphs, pseudopolymorphs and solvates. Under certain circumstances, it may also include multi-component crystals (or co-crystals) that contain the reference molecule as one of the components. Under still other circumstances, the landscape may include the crystal structures of molecules that are closely related to the reference molecule. The idea of a landscape is to facilitate the understanding of the process of crystallization. It includes all minima that can, in principle, be accessed by the molecule in question as it traverses the path from solution to the crystal. Isonicotinamide is a molecule that is known to form many co-crystals. We report here a 2:1 co-crystal of this amide with 3,5-dinitrobenzoic acid, wherein an unusual N−H⋯N hydrogen-bonded pattern is observed. This crystal structure offers some hints about the recognition processes between molecules that might be implicated during crystallization. Also included is a review of other recent results that illustrate the concept of the structural landscape.

Hydrogen-bonded coordination network in crystal structures of [Cu(3-PM)4Cl2] and [Cu(4-PM)4Cl]Cl, (PM = pyridylmethanol)

2004 ◽  
Vol 34 (7) ◽  
pp. 423-431 ◽  
Author(s):  
Jan Moncol ◽  
Marcela Mudra ◽  
Peter Lonnecke ◽  
Marian Koman ◽  
Milan Melnik
Keyword(s):  
Crystal Structures ◽  
Coordination Network ◽  
Hydrogen Bonded
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