Results 141 to 150 of about 1,117,391 (197)

SYNTHESIS AND COMPLEXATION STEREOCHEMISTRY OF CROWN ETHERS

SYNTHESIS AND COMPLEXATION STEREOCHEMISTRY OF CROWN ETHERS
openaire   +1 more source

Phosphorus-nitrogen compounds: Part 61. The novel sodium complexes of monoferrocenylspirocyclotriphosphaza-crown ethers

Inorganica Chimica Acta, 2022
In the present investigation, it is observed that condensation reactions of hexachlorocyclotriphosphazene, N3P3Cl6 (HCCP, trimer) and four different diamines (1-4) yielded tetrachloromono (5, 7 and 8) and bisferrocenyl (6) spirocyclotriphosphazenes ...
Neşe Uzunalioğlu, Tuncer Hökelek, Nuran Asmafiliz   +2 more
exaly   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Molecular complexes of crown ethers. part 2: Complexes between crown ethers and ? acceptors

Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1995
The intermolecular charge transfer (CT) complexes of four crown ethers (CE), viz. B15C5, B18C6, DB18C6 and DB24C8 (as donors), and three acceptors, i.e. tetracyanoethylene (TCNE) 7,7,8,8-tetracyanoquinodimethane (TCNQ) and chloranil were studied in the UV-Visible region in 1,2-dichloroethane (DCE) at 298.2 K.
Ghazi A. W. Derwish, Salman R. Salman, Sabri M. H. Al-Marsoumi   +2 more
openaire   +1 more source

Molecular complexes of crown ethers, part 4: Complexes of crown ethers with picric acid

Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1996
The intermolecular charge-transfer spectra of seven crown ethers (CE), viz, 15C5, 18C6, B15C5, B18C6, DC18C6, and DB24C8, with picric acid (PA) were studied in the UV-visible region in 1,2-dichloroethane (DCE) at 298.2 K. The complex formation equilibrium constant values,Kc, suggest that many factors contribute toKc, among them crown ether conformation,
Salman R. Salman, Ghazi A. W. Derwish, Sabri M. H. Al-Marsoumi   +2 more
openaire   +1 more source

Crown Ether Complexes of HPCl₆

Journal of the American Chemical Society, 2010
The reactions of HCl, PCl5, and a crown ether (12-crown-4 or 18-crown-6) in CHCl3 under anaerobic conditions give complexes of the superacid HPCl6: [H(12-crown-4)][PCl6 ] and [H(18-crown-6)2][PCl6]. The crystal structures indicate that the proton lies roughly in the center of the 12-crown-4 molecule in [H(12-crown-4)][PCl6 ] whereas it lies between two
Zin-Min, Tun, Matthew J, Panzner, Vincenzo, Scionti, Douglas, Medvetz, Chrys, Wesdemiotis, Wiley J, Youngs, Claire, Tessier   +6 more
openaire   +2 more sources

Complexation of peptides with crown ethers

Thermochimica Acta, 1993
Abstract Crystals of the complexes 18-crown-6/diglycine, 18-crown-6/diglycine/water, 18-crown-6/triglycine, 18-crown-6/ l -α-alanyl- l -α-alanine and 1,10-diaza-18-crown-6/diglycine/water were obtained. The thermal behaviour of these compounds was investigated by DSC and TGA methods.
Oleg V. Kulikov, Wojciech Zielenkiewicz, Ewa Utzig, Gennadij A. Krestov   +3 more
openaire   +1 more source

Complexes of Crown Ethers with Diaminomaleodinitrile

Russian Journal of General Chemistry, 2003
1,2-Diaminomaleodinitrile (HCN tetramer) is usu-ally considered as one of the key steps of chemicalevolution [1 4] on the pathway of transformation ofhydrogen cyanide into amino acids and heterocycles[4 6]. According to [7, 8], in simulation of biochem-ical processes, it is important to reveal noncovalentinteractions of relatively small molecules with ...
Wen-Dzvu Wang, E. V. Ganin
openaire   +1 more source

Cationic Crown Ether Complexes of Germanium(II)

Angewandte Chemie, 2009
AbstractDie Krone muss passen: Kationische GeII‐Komplexe lassen sich mit Kronenethern zum Stabilisieren und Schützen des Germaniumzentrums herstellen. Drei verschiedene Kronenether wurden eingesetzt: [12]Krone‐4 (siehe Struktur, Ge türkis, O rot, C grau), [15]Krone‐5 und [18]Krone‐6.
Paul A, Rupar, Rajoshree, Bandyopadhyay, Benjamin F T, Cooper, Michael R, Stinchcombe, Paul J, Ragogna, Charles L B, Macdonald, Kim M, Baines   +6 more
openaire   +2 more sources

Analytical Applications of Crown Ether Extraction of Cobalt Thiocyanate Complex With Ammonium-Crown Ether Complex

Analytical Letters, 1978
Abstract The effects of the ammonium-crown ether or the potassium-crown ether complex on the extraction of anionic species were studied. The cobalt thiocyanate complex was extracted into 1,2-dichloroethane by the addition of a crown ether complex. By measuring the absorbance of the organic phase at 623 nm, cobalt was determined spectrophotometrically ...
M. Yoshio, M. Ugamura, H. Noguchi, M. Nagamatsu   +3 more
openaire   +1 more source

Polycarboxylate crown ethers: Synthesis, complexation, applications

Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1989
Crown ethers derived from tartaric acid present a number of interesting features as receptor frameworks and offer a possibility of enhanced metal cation binding due to favorable electrostatic interactions. The synthesis of polycarboxylate crown ethers from tartaric acid is achieved by simple Williamson ether synthesis using thallous ethoxide or sodium ...
Philip J. Dutton, Thomas M. Fyles, Steven P. Hansen   +2 more
openaire   +1 more source