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research article

Complexes of biguanide and malonic-diamidine

Schwarzenbach, G.
•
Schwarzenbach, D.  
1977
Journal of the Indian Chemical Society

The importance of the central N atom of biguanide (L) in the stability of transition metal complexes [ML2]​2+ (M = Cu, Ni) is strikingly demonstrated by replacing the NH by CH2. The novel ligand thus obtained is malonic diamidine (L')​. [ML'2]​Cl2 (M = Cu, Ni) were prepd. and their structures detd. by x-​ray diffraction. Unlike [ML2]​2+, the [ML'2]​2+ complexes are not planar, one of the C atoms connecting the amidine groups being above and the other below the plane of the coordination square. Bond distances and angles in the 2 types of complex cations are discussed. The fact that the 2 amidine groups share no electrons and do not act in unison is no doubt the reason for the decreased stability of [ML'2]​2+ in comparison with [ML2]​2+. The latter therefore are stabilized by resonance energy to an appreciable extent.

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Type
research article
Author(s)
Schwarzenbach, G.
Schwarzenbach, D.  
Date Issued

1977

Published in
Journal of the Indian Chemical Society
Volume

54

Issue

1-3

Start page

23

End page

24

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCR  
Available on Infoscience
March 7, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/227097
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