Synthesis and characterization of a new macrocyclic Schiff base derived from 2,6-diaminopyridine and 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane and its Cu(II), Ni(II), Pb(II), Co(III) and La(III) complexes

Abstract

A new macrocyclic ligand, 1,3,5-triaza-2,4:7,8:19,20-tribenzo-9,12,15,18-tetraoxacyclounkosa-1,5-diene (L) was synthesized by reaction of 2,6-diaminopyridine and 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane. Then, its Cu II , Ni II , Pb II , Co III and La III complexes were synthesized by the template effect by reaction of 2,6-diaminopyridine and 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane and Cu(NO 3 ) 2 AE 3H 2 O, Ni(NO 3 ) 2 AE 6H 2 O, Pb(NO 3 ) 2 , Co(NO 3 ) 2 AE 6H 2 O, La(NO 3 ) 3 AE6H 2 O respectively. The ligand and its metal complexes have been characterized by elemental analysis, IR, 1 H and 13 C NMR, u.v-vis spectra, magnetic susceptibility, conductivity measurements and mass spectra. All complexes are diamagnetic and the Cu II complex is binuclear. The Co III complex was oxidized to Co III .

Synthesis and Characterization of Homo Binuclear Complexes of UO2(VI), Th(IV), ZrO(IV) and VO(IV) with Polyaza Macrocyclic Schiff-Bases

“…3 The field of macrocyclic chemistry of metals is developing very rapidly because of its importance in the area of coordination chemistry. 4 Macrocyclic compounds and their derivatives are interesting ligand systems because they are good hosts for metal anions, neutral molecules and organic cation guests. 5 The metal ion and host-guest chemistry of macrocyclic compounds are very useful in fundamental studies (in phase transfer catalysis and biological studies).…”

Synthesis and Characterization of UO2(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands

“…10 The field of macrocyclic chemistry of metals is developing very rapidly because of its importance in the area of coordination chemistry. 11 Macrocyclic compounds stry of macrocyclic compounds are very useful in fundamental studies (in phase transfer catalysis and biological studies). 13 Template condensation reactions lie at the heart of the macrocyclic chemistry.…”

Characterization and crystal structure of a 17-membered macrocyclic Schiff base compound MeO-sal-pn-bn

“…Macrocycles containing imine groups can form mono-, di-, and polynuclear transition metal complexes with various applications [11][12][13][14]. Among them a wide Schiff base macrocycles based on 2,6-diacetylpyridine and 2,6-diformylpyridine as building blocks evolved from the early studies [15].Many synthetic methods for the preparation of Schiff base macrocyclic compounds use transition metal ions as templating agents [16][17][18][19][20][21]. However, this method yields stable macrocyclic complexes, thus making the preparation of a metal free ligand difficult [16][17][18][19][20][21].…”

“…Many synthetic methods for the preparation of Schiff base macrocyclic compounds use transition metal ions as templating agents [16][17][18][19][20][21]. However, this method yields stable macrocyclic complexes, thus making the preparation of a metal free ligand difficult [16][17][18][19][20][21].…”

“…However, this method yields stable macrocyclic complexes, thus making the preparation of a metal free ligand difficult [16][17][18][19][20][21]. Therefore, during the last decade, considerable effort has been made to develop metal free methods for the preparation of Schiff base macrocyclic compounds [15,[22][23][24].…”