ISSN 10703284, Russian Journal of Coordination Chemistry, 2015, Vol. 41, No. 1, pp. 25–30. © Pleiades Publishing, Ltd., 2015.
Schiff bases have been extensively used as ligands to
construct complexes with various metal ions. In the
last decades, numerous Schiff bases and their com
plexes have been prepared and studied their properties,
such as magnetic [1–5], catalytic [6–10], luminescence
, as well as biological applications [12–15]. Among
the complexes, most are derived from mono or bis
Schiff bases. Tris(2aminoethyl)amine is an interest
ing primary amine, which can react with aldehydes to
form tripodal Schiff bases. During the search of litera
ture, we find that the complexes derived from triSchiff
bases are very rare. In this paper, a tripodal Schiff base
and its manganese complex (
) were prepared, and
studied on their antibacterial properties.
The article is published in the original.
Materials and methods.
5bromosalicylaldehyde, and manganese perchlorate
were obtained from commercial sources and were used
as received without further purification. Elemental
analyses of C, H, and N were performed using a Perk
inElmer 240C elemental analyzer. IR spectra were re
corded as KBr pellets using a Magna 750 FTIR spec
H NMR was recorded on a Bruker
Although we did not experience any prob
lem with the compounds reported in this work, per
chlorate salts are potentially explosive. Only a small
amount of material should be prepared, and it should
be handled with care.
Synthesis of the tripodal Schiff base (H
mosalicylaldehyde (6.03 g, 0.3 mol) was dissolved in
30 mL methanol, to which was added dropwise a metha
nolic solution (20 mL) of tris(2aminoethyl)amine
(1.46 g, 0.1 mol). The color changed from colorless to
orange during the reaction procedure. The reaction
was continued for 30 min, and the solvent was allowed
to slow evaporate in air. Yellow single crystals were ob
tained in 5 days. The yield was 73%. IR (KBr;
H NMR data (300 MHz; DMSO;
ppm): 13.61 (s., 3H), 8.37 (s., 3H), 7.73 (s, 3H), 7.38
= 8.8, 2.4 Hz, 3H), 6.77 (d., 3H), 3.62 (t., 6H),
2.76 (t., 6H).
anal. calcd., %: C, 46.64; H, 3.91; N, 8.06.
Found, %: C, 46.83; H, 4.00; N, 7.95.
Synthesis, Crystal Structures, and Antibacterial Property
and Its Manganese(III) Complex
Y. M. Hao
Department of Chemistry, Baicheng Normal University, Baicheng, 137000 P.R. China
Received June 13, 2014
A tripodal Schiff base tris[2(5bromosalicylideneamino)ethyl]amine (H
L) was prepared by the
reaction of 5bromosalicylaldehyde with tris(2aminoethyl)amine. Reaction with the Schiff base with manganese
perchlorate in methanol resulted a mononuclear manganese(III) complex (
). The crystal structures of the
Schiff base and the complex have been determined by single crystal Xray diffraction (CIF files CCDC
nos. 1007902 (H
L); 1007 983 (
)). The Schiff base coordinates to the Mn atom through all the phenolate O
and imino N atoms. The Mn atom of the complex is in octahedral coordination. The antibacterial properties
have been tested on some bacteria and yeast.