Synthesis and characterization of Cd(II) macrocyclic schiff base complex with two 2-Aminoethyl pendant arms

Abstract

A new pendant armed Schiff base macrocyclic complex of [CdL] 2+ , was prepared via cyclocondensation of 2,6-bis(2-formylphenoxymethyl)pyridine with branched hexaamine in the presence of Cd(II) ion. The ligand was 23-membered oxaazamacrocycle having two 2-aminoethyl pendant arms [L: 3,28-dioxa-14,17-bis(aminoethyl)-11,14,17,20,34-pentaazatetracyclo[34.3.1] tetratriacontane-1(34), 4, 6, 8, 10, 20, 22, 24, 26, 30, 32-undecaene]. The complex was investigated by IR, 1 H NMR, microanalysis and MALDI mass spectroscopy. The structure of the complex was verified by ab initio HF-MO calculations using a standard 3-21G* basis set. This article introduces an unusual seven-membered chelate ring and shows that by its using, the Cd-N bonds lengths within the macrocycle would be longer and also Cd(II)-pendant amine bonds lengths would be shorter.

MALDI‐TOFMS analysis of coordination and organometallic complexes: a nic(h)e area to work in

“…Since 2005 many other systems have been investigated. These include, but are not limited to, porphyrins and phthalocyanines,26–37 other nitrogen heterocycles,26, 38–46 other nitrogen ligands,47–53 metallocenes/aryl ligands,26, 54–60 phosphorus ligands,26, 44, 57, 59, 61–63 hydrazones,64 carboxylates,51, 54, 65 thiophenes,66, 67 acetylacetonates,59, 68 ethers,69, 70 polyynes/cumulenes,71 acetohydrazides,72 octreotate,73 tripsalen,74 thiols75 and quinolates 76. Successfully characterised compounds have contained, but are not limited to, magnesium,37 the first‐row transition metals in general,63, 68 specifically vanadium,59 chromium,74 manganese,28, 74 iron,26, 35, 40, 54, 59, 60, 63, 66, 74 cobalt,28, 29, 31, 33, 34, 40, 42, 64, 72 nickel,29, 33, 40, 64, 67, 72 copper,26, 29, 31, 33, 34, 39, 52, 64, 71, 72 zinc,26, 28, 29, 31–34, 40, 45, 48, 55, …”

“…Successfully characterised compounds have contained, but are not limited to, magnesium,37 the first‐row transition metals in general,63, 68 specifically vanadium,59 chromium,74 manganese,28, 74 iron,26, 35, 40, 54, 59, 60, 63, 66, 74 cobalt,28, 29, 31, 33, 34, 40, 42, 64, 72 nickel,29, 33, 40, 64, 67, 72 copper,26, 29, 31, 33, 34, 39, 52, 64, 71, 72 zinc,26, 28, 29, 31–34, 40, 45, 48, 55, 64, 65, 72 gallium,26, 42 the Group 4 metals,58 ruthenium,26, 44, 46, 53, 57, 73 rhodium,26 palladium,28, 41, 49, 50, 53, 55, 61–63, 67 silver,28, 29, 52, 71 cadmium,40, 43, 47, 72 indium,42 tin,38, 51, 54, 69, 70 rhenium,26 osmium,26 iridium,39, …”

(E)-2-{[(2-Aminophenyl)imino]methyl}-5-(benzyloxy)phenol and (Z)-3-benzyloxy-6-{[(5-chloro-2-hydroxyphenyl)amino]methylidene}cyclohexa-2,4-dien-1-one

“…Schiff base compounds exhibit a broad range of biological activities, including antifungal and antibacterial (da Silva et al, 2011). They are used as anion sensors (Dalapati et al, 2011;Khalil et al, 2009), non-linear optical compounds (Sun et al, 2012), and as versatile ligands in coordination chemistry (Khanmohammadi et al, 2009;Keypour et al, 2010). In view of the interest in such materials we have synthesized the title compounds, (I) and (II), and report their crystal ISSN 2056-9890 structures here.…”

Synthesis and characterization of four new unsymmetrical potentially pentadentate Schiff base ligands and related Zn(II) and Cd(II) complexes

“…The presence of both hard and soft donor atoms in the backbones of unsymmetrical Schiff bases ligands, they readily coordinate with a wide range of transition metal ions [1][2][3][4][5][6][7][8]. Most of these unsymmetrical Schiff bases ligands obtained by the condensation of different types of primary amines with various ketones and aldehydes [9,10] by metal-templated [11][12][13] or by direct syntheses [14,15].…”