Ligand design and synthesis. II. Linear five-donor-atom compounds derived from 1,5-Dibromo-3-azapentane

1971 ◽  
Vol 24 (7) ◽  
pp. 1391 ◽  
Author(s):  
DSC Black ◽  
IA McLean
Keyword(s):  
Ligand Design ◽  
Donor Atom ◽  
Design And Synthesis ◽  
Pure Cobalt ◽  
Oxygen Donor ◽  
Steric Crowding

A series of linear, five-donor-atom compounds, with nitrogen, sulphur, and oxygen donor-atoms, has been prepared to examine the effects of steric crowding on the formation of octahedral complexes. 1,11-Diamino- 3,9-dithia-6-azaundecane (5) and 4-methyl-1,7-di(8?-quinolyl)-1,7- dithia-4-azaheptane (6) form octahedral complexes with Ni(ClO4)2 or Co(ClO4)2. An increase in the bulkiness of the ligand, as shown by 1,11- bis(dimethylamino)-3,9-dithia-6-azaundecane (7), led to the formation of five-coordinate or partially five-coordinate cobalt(II) and nickel(II) complexes. With 1,11-bis(diethylamino)-3,9-dithia-6- azaundecane (8), a very hindered ligand, no pure cobalt(II) or nickel(II) complexes could be isolated. Several other hindered compounds containing all sulphur, or sulphur and oxygen, central donor- atoms did not form pure complexes when treated with Co(ClO4)2 or Ni(ClO4)2.

An Investigation of AlCl3 Solutions in Ethers by 27Al NMR Spectroscopy

1982 ◽  
Vol 37 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Heinrich Nöth ◽  
Robert Rurländer ◽  
Peter Wolfgardt
Keyword(s):  
Nmr Spectroscopy ◽  
Donor Atom ◽  
Dilute Solutions ◽  
27Al Nmr ◽  
Nmr Studies ◽  
27Al Nmr Spectroscopy ◽  
Oxygen Donor ◽  
Tetrahedral Environment ◽  
Peak Areas ◽  
High Concentrations

Abstract27Al NMR studies of AlCl3 solutions in diethyl ether reveal the presence of AlCl4 at high concentrations. This ion can also be recognized besides AlCl3·OR2 at low temperature in dilute solutions, while at 25 °C a single signal is observed, which represents the average of all species in solution. More extensive dissociation of AlCl3 results in tetrahydrofuran. The main species in equilibrium with one another are AlCl3·2THF, AlCl-4 and AlCl2(THF)+2.Nearly quantitative dissociation to yield AlCl-4 and [AlClL5]2+ occurs in dilute solutions of AlCl3 in monoglyme (L reprents one oxygen donor atom); at higher concentration an adduct AlCl3·L with Al in a tetrahedral environment is also present. This trend towards extensive dissociation is also observed in the solutions of AlCl3 in diglyme and triglyme. Relative peak areas are in agreement with the formation of a 1:1 electrolyte [AlCl2L4]+AlCl-4 in diglyme, whereas additional dissociation into [AlClL5]2+ and AlCl-4 occurs in triglyme.

Design and synthesis of a series of facially coordinating tridentate ligands containing an N2O donor atom set

1989 ◽  
Vol 30 (13) ◽  
pp. 1609-1612 ◽  
Author(s):  
Donald L. Jameson ◽  
Sharon E. Hilgen ◽  
Conrad E. Hummel ◽  
Susan L. Pichla
Keyword(s):  
Donor Atom ◽  
Tridentate Ligands ◽  
Design And Synthesis

Ligand design and synthesis. I. 3-Amino-1-(8'-quinolyl)-1-thiapropane and related ligands

1971 ◽  
Vol 24 (7) ◽  
pp. 1377 ◽  
Author(s):  
DSC Black ◽  
IA McLean
Keyword(s):  
Metal Complexes ◽  
Template Synthesis ◽  
Ligand Design ◽  
Design And Synthesis

The chelating properties of 3-amino-I-(8?-quinolyl)-1-thiapropane (2) are discussed. The related ligands 1-(2?-hydroxyphenyl)-6-(8?- quinolyl)-5-thia-2-azapent-1-ene (6), 1-(6?-bromo-2?-hydroxyphenyl)-5- (8?-quinolyl)-5-thia-2-azapent-1-ene (7), 5-(2?-pyridyl)-1-(8?- quinolyl)-1-thia-4-azahex-4-ene (8), and 5-[2?-(6?-acetylpyridyl)]-1- (8?-quinolyl)-1-thia-4-azahex-4-ene (13), and some of their metal complexes are described. The iron(II) sexadentate chelate (17) has been prepared by a metal template synthesis from the amine (2) and glyoxal.

Ligand design and synthesis

1973 ◽  
Vol 9 (3-4) ◽  
pp. 219-274 ◽  
Author(s):  
D.St.C. Black ◽  
A.J. Hartshorn
Keyword(s):  
Ligand Design ◽  
Design And Synthesis

Ligand design and synthesis. III. Cyclic multidentate ligands with 12- and 18-membered rings

1971 ◽  
Vol 24 (7) ◽  
pp. 1401 ◽  
Author(s):  
DSC Black ◽  
IA McLean
Keyword(s):  
Ligand Design ◽  
Multidentate Ligands ◽  
High Dilution ◽  
Dilution Technique ◽  
Template Effect ◽  
Design And Synthesis ◽  
Halide Ligands

A number of cyclic ligands has been prepared by the high-dilution technique. All these ligands have their donor-atoms linked by ethano bridges. Examples of a non-planar quadridentate and three potential sexadentates were prepared. The cyclic quadridentete, 1-oxa-4,10- dithia-7-azacyclododecane (1), formed neutral complexes of the type [MLX2], where M = Co, X = Cl, Br and M = Ni, X = Cl, which are octahedral and presumably have the halide ligands cis to each other. Two of the cyclic ligands, 1,4,10,13-tetrathia-7,16- diazacyclooctadecane (3) and 1,4,7,10,13,16-hexathiacyolooctadecane (4), are the first reported cyclic sexadentates which form octahedral complexes, and the first examples of cyclic sexadentate ligands prepared without the aid of the metal template effect. Complexes of the type [ML](picrate)2, where M = Co, Ni, were prepared from ligands (3) and (4). A third potential sexadentate, 1,10-dioxa-4,7,13,16- tetrathiaoyolooctadecane (5), did not form complexes when treated with MX2, where M = Co, Ni, Fe, Cu and x = Cl, ClO4.

Ligand design for complexation in aqueous solution. 1. Neutral oxygen donor bearing groups as a means of controlling size-based selectivity for metal ions

1989 ◽  
Vol 28 (2) ◽  
pp. 187-194 ◽  
Author(s):  
Robert D. Hancock ◽  
Rekha Bhavan ◽  
Peter W. Wade ◽  
Jan C. A. Boeyens ◽  
Susan M. Dobson
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Ligand Design ◽  
Oxygen Donor
Sign in / Sign up

Export Citation Format

Share Document