Issue 31, 2014

Heteronuclear, mixed-metal Ag(i)–Mn(ii) coordination polymers with bridging N-pyridinylisonicotinohydrazide ligands: synthesis, crystal structures, magnetic and photoluminescence properties

Abstract

Mixed-metal dicyanoargentate-bridged coordination polymers of Ag(I)–Mn(II) have been prepared and their structure and magnetic properties were determined. Reaction of manganese(II) chloride and potassium dicyanoargentate(I) with (X)(pyridin-2-ylmethylene)isonicotinohydrazide ligands (HL1 X = Ph, HL2 X = Me, HL3 X = H) produced the coordination polymer 2D-[Mn(μ-L1)(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n (1), 1D-{[Mn(L2)(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]CH3OH}n (2) and [Mn(L3)(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n (3) in good yields. Trinuclear {Mn(μ-L1)Mn(μ-L1)Mn} and [Ag(CN)2] building units form a two-dimensional slab in 1 and 1D strands in 2. Variable temperature magnetic susceptibility measurements showed that despite the long distance among the high spin Mn(II) ions [10.4676(12) Å and 10.522(1) Å, for 1 and 2, respectively], weak antiferromagnetic coupling takes place through the long NC–Ag–CN bridge. The best fit parameters to the model led to the magnetic coupling constant of J = −0.1 and J = −0.47 cm−1 for 1 and 2, respectively. The photoluminescence behaviour of compounds 1 and 2 was studied. The spectrum of compound 1 shows a broad emission centered at about 450 nm and two excitation maxima at 270 and 310 nm.

Graphical abstract: Heteronuclear, mixed-metal Ag(i)–Mn(ii) coordination polymers with bridging N-pyridinylisonicotinohydrazide ligands: synthesis, crystal structures, magnetic and photoluminescence properties

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2014
Accepted
11 Jun 2014
First published
12 Jun 2014

Dalton Trans., 2014,43, 11925-11935

Heteronuclear, mixed-metal Ag(I)–Mn(II) coordination polymers with bridging N-pyridinylisonicotinohydrazide ligands: synthesis, crystal structures, magnetic and photoluminescence properties

R. Bikas, H. Hosseini-Monfared, V. Vasylyeva, J. Sanchiz, J. Alonso, J. M. Barandiaran and C. Janiak, Dalton Trans., 2014, 43, 11925 DOI: 10.1039/C4DT01390E

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