Issue 3, 2006
From the journal:

Journal of Materials Chemistry

Unexpected diversity and novel features within a family of new azide-bridged MnII complexes of pyridyl/imineligands

Tapan K. Karmakar,a   Guillem Aromí,*b   Barindra K. Ghosh,a   A. Usman,c   Hoong-Kun Fun,c   Talal Mallah,d   U. Behrens,e   Xavier Solansf  and  Swapan K. Chandra*ag  

* Corresponding authors

a Department of Chemistry, The University of Burdwan, Burdwan, India
E-mail: dr_swapan@sify.com
Fax: +91 342 2557938

b Universitat de Barcelona, Departament de Química Inorgànica, Diagonal 647, Barcelona, Spain
E-mail: guillem.aromi@qi.ub.es
Fax: +34 93 4907725;

c X-Ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, Malaysia

d Laboratoire de Chimie Inorganique, Université Paris-Sud, Bat. 420, UMR CNRS 8613, 91405 Orsay, France

e Institute Anorgan. und Angew. Chem, Martin Luther King Pl 6, Germany

f Departament de Cristallografia i Mineralogia, Universitat de Barcelona, Martí i Franquès s/n, Barcelona, Spain

g Department of Chemistry, Visva Bharati, Santiniketan, India

Abstract

A family of tetradentate ligands, [N,N′-bis(pyridine-2-yl)]ethane-1,2-diamine (L1), [N,N′-bis(pyridine-2-yl)]propane-1,3-diamine (L2) and [N,N′-bis(pyridine-2-yl)]butane-1,4-diamine (L3) has been prepared. These ligands differ only in the number of CH2 groups separating two pyridyl/imine moieties, however, in reactions with MnII and N−3 salts, they produce structurally very diverse solids; [Mn2(L1)3(N3)]n(ClO4)3n (1), [Mn2(L2)2(N3)2](PF6)2 (2) and [Mn2(L3)(N3)2]n(ClO4)2n (3). Complexes 1, 2 and 3 consist of azido-bridged magnetically dilute Mn2 pairs, arranged as 1-D, discrete and 2-D arrays, respectively. In these materials, the connection between Mn centers within the dinuclear entities occurs through mono-1,3-N−3, bis-1,3-N−3 and bis-1,1-N−3 bridges, respectively, for 1, 2 and 3. Bulk magnetic measurements reveal that the coupling within such units is antiferromagnetic (J = −1.8 cm−1, 1; J = −4.8 cm−1, 2) and ferromagnetic (J = +1.45 cm−1, 3), depending on whether the N−3 binding mode is end-to-end (EE) or end-on (EO). The reported values are given according to the convention H = −2JS1S2 for the spin-Hamiltonian.

Graphical abstract: Unexpected diversity and novel features within a family of new azide-bridged MnII complexes of pyridyl/imine ligands

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Article information

DOI
https://doi.org/10.1039/B510701F
Article type
Paper
Submitted
27 Jul 2005
Accepted
17 Oct 2005
First published
04 Nov 2005

J. Mater. Chem., 2006,16, 278-285

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Unexpected diversity and novel features within a family of new azide-bridged MnII complexes of pyridyl/imine ligands

T. K. Karmakar, G. Aromí, B. K. Ghosh, A. Usman, H. Fun, T. Mallah, U. Behrens, X. Solans and S. K. Chandra, J. Mater. Chem., 2006, 16, 278 DOI: 10.1039/B510701F

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