scholarly journals Synthesis and Characterization of a Tetraaza Macrocyclic Nickel(II) Complex Bearing Two Amidine Pendant Arms: Unprecedented Strong Metal-Pendant Arm Interaction

2005 ◽  
Vol 26 (11) ◽  
pp. 1861-1864 ◽  
Keyword(s):  
Synthesis And Characterization ◽  
Pendant Arm ◽  
Pendant Arms ◽  
Macrocyclic Nickel

scholarly journals Synthesis and characterization of Ni(II), Cu(II) and Co(III) complexes with polyamine-containing macrocycles bearing an aminoethyl pendant arm

2004 ◽  
Vol 69 (8-9) ◽  
pp. 641-649 ◽  
Author(s):  
Fouzia Rafat ◽  
M.Y. Siddiqi ◽  
K.S. Siddiqi
Keyword(s):  
Metal Ion ◽  
Magnetic Moments ◽  
Carbon Chain ◽  
Macrocyclic Complex ◽  
Synthesis And Characterization ◽  
Epr Spectrum ◽  
Pendant Arm ◽  
Octahedral Environment ◽  
Electrical Conductivities

Reaction of [M(ppn)2]X2 (where M = Cu(II), Ni(II), Co(II) and ppn = 1,3-diaminopropane) with formaldehyde and ethylenediamine in methanol results in the ready formation of a 16-membered macrocyclic complex. The complexes were characterized by elemental analysis, IR, EPR, electronic spectral data magnetic moments and conductance measurements. The Cu(II), Ni(II) and Co(III) complexes are coordinated axially with both pendant groups of the hexadentate macrocycle. These pendant donors are attached to the macrocycle by a carbon chain. The electrical conductivities of the Cu(II) and Ni(II) chelates indicated them to be 1:2 electrolytes whilst those of Co(III) is a 1:3 electrolyte in DMSO. The EPR spectrum of the copper complex exhibited G at 3.66, which indicates a considerable exchange interaction in the complex. Spectroscopic evidence suggests that in all of the complexes the metal ion is in an octahedral environment.

Synthesis and characterization of the cobalt(III) complexes of two pendant-arm cross-bridged cyclams

2004 ◽  
Vol 357 (2) ◽  
pp. 615-618 ◽  
Author(s):  
Jonas Lichty ◽  
Shawn M. Allen ◽  
Adedamola I. Grillo ◽  
Stephen J. Archibald ◽  
Timothy J. Hubin
Keyword(s):  
Synthesis And Characterization ◽  
Pendant Arm

Synthesis and Characterization of Pendant Arm Encapsulated Complexes of Cobalt(III)

1989 ◽  
Vol 42 (5) ◽  
pp. 649 ◽  
Author(s):  
AA Achilleos ◽  
LR Gahan ◽  
KA Nicolaidis
Keyword(s):  
Convenient Method ◽  
Acidic Solution ◽  
Synthesis And Characterization ◽  
Protecting Group ◽  
Chromatographic Purification ◽  
Chemical Modifications ◽  
Reaction Conditions ◽  
Pendant Arm ◽  
Derivatives Of

The synthesis and characterization of an octahedral cobalt(III) complex of the octaamine ligand 5,5-bis(4-amino-2-azabutyl)-3,7-diazanonane-1,9-diamine, [co( asen )]3+, is described. Two approaches to the preparation of encapsulated derivatives of [Co(asen)]3+ are also described. The first approach involves reaction of [Co(asen)]3+ with nitromethane and formaldehyde in the presence of base. After extensive chromatographic purification [(1-(4-amine-2-azabutyl)-8-nitro-3,6,10,13,16,19-hexaazabicyclo[6.6.6] icosane )cobalt(III)]5+ was isolated. The second more convenient method employs precautionary protection of the pendant primary amine of [Co( asen )]3+, as the benzenesulfonate, prior to reaction with the same capping reagents. Both approaches result in an encapsulated complex bearing a pendant 4-amine-2-azabutyl moiety. The protecting group is stable under reaction conditions required for successive chemical modifications of the capping nitro group to amine, chloro and proton capped cages, but is readily removed in refluxing acidic solution.

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