In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2005, No. 17 ( 2005-09), p. 3479-3490
Abstract:
Neutral manganese( II ), iron( II ), cobalt( II ), nickel( II ), zinc( II ) and cadmium( II ) complexes with an N ‐tosyl‐substituted N 4 ‐donor Schiff base containing a 4,4'‐methylenedianiline residue as spacer [H 2 L a : N , N' ‐bis(2‐tosylaminobenzylidene)‐4,4'‐methylenedianiline], and the zinc( II ) complex with an analogous ligand [H 2 L b : N , N' ‐bis(2‐tosylaminobenzylidene)‐4,4'‐oxodianiline] have been prepared by an electrochemical procedure. FAB and ESI mass spectra of the complexes show peaks due to species corresponding to a general formula [M 2 (L a,b ) 2 + H] + , thereby suggesting their dinuclear nature. A detailed study of the crystal packing in the unit cell of the zinc( II ) complex with H 2 L a shows that the helicates aggregate to form discrete prismatic moieties containing three molecules held together by π–π and σ–π interactions. Moreover, the Zn II neutral dihelicate with H 2 L b forms a 3D network in the solid state due to intermolecular π‐stacking interactions. 1 H NMR studies of the diamagnetic compounds reported herein have been performed. Finally, the ligand H 2 L a and its Zn II and Cd II complexes have been studied by spectrophotometric and spectrofluorimetric techniques in order to get a better understanding of the formation mechanisms of the complexes and of the nature of their fluorescence emission. Emission studies show that the Zn II and Cd II dihelicates with H 2 L a display a green fluorescence in acetonitrile solution ( λ = 473 nm, Φ = 0.03 and λ = 476 nm, Φ = 0.01, respectively). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2005:17
DOI:
10.1002/ejic.200500142
Language:
English
Publisher:
Wiley
Publication Date:
2005
detail.hit.zdb_id:
1475009-0
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