Structure and IR spectroscopic properties of the anhydrous 4-N,N-dimethylaminopyridinium pentachlorophenolate

1995 ◽  
Vol 25 (4) ◽  
pp. 189-193 ◽  
Author(s):  
I. Majerz ◽  
Z. Malarski ◽  
W. Sawka-Dobrowolska
Keyword(s):  
Spectroscopic Properties ◽  
Ir Spectroscopic

Syntheses, structures and characterization of isomorphous CoII and NiII coordination polymers based on 2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole and benzene-1,4-dicarboxylate

2017 ◽  
Vol 73 (8) ◽  
pp. 645-651 ◽  
Author(s):  
Qiu-Ying Huang ◽  
Yang Zhao ◽  
Xiang-Ru Meng
Keyword(s):  
Coordination Polymers ◽  
Rational Design ◽  
Three Dimensional ◽  
Spectroscopic Properties ◽  
Polymeric Chain ◽  
Design And Synthesis ◽  
Carboxylate Groups ◽  
Metal Organic ◽  
The One ◽  
Ir Spectroscopic

Careful choice of the organic ligands is one of the most important parameters in the rational design and synthesis of coordination polymers. Aromatic polycarboxylates have been widely used in the preparation of metal–organic polymers since they can utilize various coordination modes to form diverse structures and can act as hydrogen-bond acceptors and donors in the assembly of supramolecular structures. Nitrogen-heterocyclic organic compounds have also been used extensively as ligands for the construction of polymers with interesting structures. In the polymers catena-poly[[[diaquabis{2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole-κN 3}cobalt(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O 1:O 4] dihydrate], {[Co(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n , (I), and catena-poly[[[diaquabis{2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole-κN 3}nickel(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O 1:O 4] dihydrate], {[Ni(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n , (II), the CoII or NiII ion lies on an inversion centre and exhibits a slightly distorted octahedral coordination geometry, coordinated by two N atoms from two imidazole rings and four O atoms from two monodentate carboxylate groups and two water molecules. The dicarboxylate ligands bridge metal ions forming a polymeric chain. The 2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole ligands coordinate to the CoII or NiII centres in monodentate modes through an imidazole N atom and are pendant on opposite sides of the main chain. The two structures are isomorphous. In the crystal, the one-dimensional chains are further connected through O—H...O, O—H...N and N—H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the IR spectroscopic properties, PXRD patterns, thermogravimetric behaviours and fluorescence properties of both polymers have been investigated.

Relaxation and IR spectroscopic properties of the CN− stretching mode in silver halides

1995 ◽  
Vol 134 (1-4) ◽  
pp. 341-344
Author(s):  
C. E. Mungan ◽  
U. Happeki ◽  
W. Von Der Osten ◽  
A. J. Severs
Keyword(s):  
Spectroscopic Properties ◽  
Silver Halides ◽  
Ir Spectroscopic

scholarly journals ISO and Laboratory Astrophysics

1992 ◽  
Vol 150 ◽  
pp. 15-16
Author(s):  
L. J. Allamandola
Keyword(s):  
Spectroscopic Properties ◽  
Laboratory Astrophysics ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
High Quality ◽  
Mid Infrared ◽  
Limited Access ◽  
Diagnostic Capabilities ◽  
Ir Spectroscopic

ISO, the Infrared Space Observatory is capable of measuring spectra across most of the mid-infrared, the region from 4000 to 500 cm−1 (2.5-20 μm). Of these 3500 cm−1, about 670 have been inaccessible to astronomers due to strong atmospheric absorptions and about 750 cm−1 require an airborne platform, making access limited. ISO will provide high quality spectra in the 19% of the celestial mid-infrared which has never been studied and dramatically increase the number of spectra in the 21% with limited access. Thus ISO has the potential to nearly double our knowledge of the mid-IR spectroscopic properties of the cosmos. This knowledge, in turn, will revolutionize our understanding of its chemical make-up because of the mid-infrared's powerful compositional diagnostic capabilities.

Synthesis, Crystal Structures, and Thermal and Spectroscopic Properties of Thiocyanato Coordination Compounds with 3-Acetylpyridine as a Ligand

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1419-1428
Author(s):  
Julia Werner ◽  
Inke Jeß ◽  
Christian Näther
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Coordination Compounds ◽  
Spectroscopic Properties ◽  
Second Step ◽  
Crystalline Phases ◽  
Thermogravimetric Investigations ◽  
New Compounds ◽  
Ir Spectroscopic

Abstract The reaction of transition metal thiocyanates with 3-acetylpyridine (3-Acpy) leads to the formation of compounds of compositions M(NCS)2(3-Acpy)4 (M1; M = Mn, Fe, Ni) and M(NCS)2(3- Acpy)2(H2O)2 (M2; M = Mn, Fe, Ni). Thermogravimetric investigations show that in the first step some of these compounds transform into the new coordination polymers M(NCS)2(3-Acpy)2 (M3 with M = Mn, Fe and Ni), that decompose into the new compounds M(NCS)2(3-Acpy) (M4 with M = Mn and Ni) in the second step. Unfortunately, the powder patterns of compounds M3 and M4 cannot be indexed, and there are strong indications that these compounds are contaminated with a small amount of the precursor or unknown crystalline phases. IR spectroscopic investigations indicate that in compounds M3 the metal cations are linked by μ-1,3-bridging thiocyanato anions into 1D or 2D coordination polymers that are further linked by the 3-Acpy ligands in compounds M4.

A new two-dimensional CdIIcoordination polymer based on 2-(1H-imidazol-1-ylmethyl)-6-methyl-1H-benzimidazole and benzene-1,2-dicarboxylate: synthesis, crystal structure and characterization

2017 ◽  
Vol 73 (10) ◽  
pp. 828-832 ◽  
Author(s):  
Huai-Xia Yang ◽  
Yan-Qiu Yang ◽  
Di Cheng ◽  
Ya-Xue Li ◽  
Xiang-Ru Meng
Keyword(s):  
Crystal Structure ◽  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Water Molecule ◽  
Spectroscopic Properties ◽  
Organic Ligands ◽  
Two Dimensional ◽  
Coordination Environment ◽  
Dimensional Network ◽  
Ir Spectroscopic

In the construction of coordination polymers, many factors can influence the formation of the final architectures, such as the nature of the metal centres, the organic ligands and the counter-anions. In the coordination polymer poly[aqua(μ-benzene-1,2-dicarboxylato-κ4O1,O1′:O2,O2′)[μ-2-(1H-imidazol-1-ylmethyl)-6-methyl-1H-benzimidazole-κ2N2:N3]cadmium(II)], [Cd(C12H12N4)(C8H4O4)(H2O)]nor [Cd(immb)(1,2-bdic)(H2O)]n, each CdIIion is seven-coordinated by two N atoms from two symmetry-related 2-(1H-imidazol-1-ylmethyl)-6-methyl-1H-benzimidazole (immb) ligands, by four O atoms from two symmetry-related benzene-1,2-dicarboxylate (1,2-bdic2−) ligands and by one water molecule, leading to a CdN2O5distorted pentagonal bipyramidal coordination environment. The immb and 1,2-bdic2−ligands bridge CdIIions and form a two-dimensional network structure. O—H...O and N—H...O hydrogen bonds stabilize the structure. In addition, the IR spectroscopic properties, PXRD patterns, thermogravimetric behaviour and fluorescence properties of the title polymer have been investigated.

Polariton effect on the IR spectroscopic properties of crystals with symmetric O·H·O hydrogen bonds

1997 ◽  
Vol 436-437 ◽  
pp. 301-307 ◽  
Author(s):  
A. Barabash ◽  
T. Gavrilko ◽  
V. Krasnoholovets ◽  
G. Puchkovskaya
Keyword(s):  
Hydrogen Bonds ◽  
Spectroscopic Properties ◽  
Ir Spectroscopic
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