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Inorganica Chimica Acta 294 (1999) 87 – 94
Note
Cadmium(II) complexes with
[(4-methylphenyl)sulfonyl]-2-pyridyl-amine: crystal structures of
bis{[(4-methylphenyl)sulfonyl]-2-pyridyl-amide}cadmium(II); aquo-
bis(pyridine) bis{[(4-methylphenyl)sulfonyl]-2-pyridyl-amide}-
cadmium(II) and 1,10-phenanthroline bis{[(4-methylphenyl)-
sulfonyl]-2-pyridyl-amide}cadmium(II)
Santiago Cabaleiro
a
, Ezequiel Va ´zquez-Lo ´ pez
a
, Jesu ´ s Castro
a
,
Jose ´ A. Garcı ´a-Va ´zquez
b
, Jaime Romero
b
, Antonio Sousa
b,
*
a
Departamento de Quı ´mica Inorga ´nica, Uniersidade de Vigo, E-36200 Vigo, Galicia, Spain
b
Departamento de Quı ´mica Inorga ´nica, Uniersidade de Santiago de Compostela, E-15706 Santiago de Compostela, Galicia, Spain
Received 7 May 1999; accepted 29 June 1999
Abstract
Electrochemical oxidation of cadmium in a solution of [(4-methylphenyl)sulfonyl]-2-pyridyl-amine (HL) in acetonitrile/
dichloromethane afforded the compound [CdL
2
]. When pyridine (py), 2,2-bipyridine (bipy) or 1,10-phenanthroline (phen) was
added to the electrolytic phase, [CdL
2
py
2
(H
2
O)], [CdL
2
bipy] and [CdL
2
phen] were obtained. The crystal structures of [CdL
2
](1),
[CdL
2
py
2
(H
2
O)] (2) and [CdL
2
phen] (3) have been determined by X-ray diffraction techniques. The complex [CdL
2
] is best
described in terms of a linear polymer with the metal atom in a [CdN
4
O
2
] distorted octahedral environment. The [CdL
2
py
2
(H
2
O)]
and [CdL
2
phen] complexes are monomeric, with the cadmium atoms in [CdN
6
O] distorted pentagonal bipyramid and [CdN
6
]
trigonal prismatic environments, respectively. © 1999 Elsevier Science S.A. All rights reserved.
Keywords: Crystal structures; Electrochemistry; Cadmium complexes; Amide complexes
1. Introduction
Electrochemical procedures have been widely used
for the synthesis of metallic complexes, especially of
those of weakly acid organic ligands [1–5]. Of particu-
lar relevance to the present work are metal complexes
with heterocyclic ligands such as pyridine derivatives,
(I), containing, apart from the nitrogen atom, sulfur
[6,7], oxygen and sulfur [8] or selenium [9] atoms as
additional donor atoms.
We have now extended our previous work to the
electrochemical synthesis of cadmium(II) complexes
with a ligand of type (I) bearing a secondary amide
(X =NR) group. Although it is well known that metal
complex formation by metal substitution of the amide
proton is not an easy process [10], the presence of an
* Corresponding author. Tel.: +34-981-563 100; fax: +34-981-
597 525.
E-mail addresses: fojo@uvigo.es (J. Castro), qiansoal@usc.es (A.
Sousa)
0020-1693/99/$ - see front matter © 1999 Elsevier Science S.A. All rights reserved.
PII:S0020-1693(99)00265-0