4th EucheMs chemistry congress

Poster Session 1
s934
chem. Listy 106, s587–s1425 (2012)
Poster session 1 - inorganic Chemistry
P - 0 1 4 6
StruCturAL ModifiCAtionS of the
heteroBiMetALLiC Mn-Pt thioCyAnAto
CoMPLexeS And their infLuenCe on the
MAGnetiC ProPertieS
t.SiLhA 1 , i. neMeC 1 , r. herCheL 1 , z. trávníCeK 1
1 Regional Centre of Advanced Technologies and Materials
Palacky University in Olomouc, Department of Inorganic
Chemistry, Olomouc, Czech Republic
Manganese complexes with tetradentate Schiff base ligands
can be used for the targeted syntheses of polynuclear or polymeric
coordination compounds exhibiting single molecule magnetism
(SMM) or single chain magnetism (SCM). The SMM behavior
originates in a combination of the high spin state of the central
metal atom and uniaxial magnetic anisotropy, which both can be
attributed to the Mn(III) polynuclear complexes [1–2] .
This work presents synthesis and characterization of the
trinuclear and polynuclear heterobimetalic complexes, which
consist of the magnetically active parts involving the manganese
central atom (MnIII , S=2) coordinated by a tetradentate Schiff base
(L4 = derivatives of N,N'-bis(salicylidene)-1,2-diaminethane
dianion). These parts are bridged by the diamagnetic
[Pt(SCN) ] 4 2- and [Pt(SCN) ] 6 2- species: [(solv)(L4 )Mn{μ - 2
-Pt(SCN) }Mn(L 4 4 )(solv)], [(solv)(L 4 )Mn{μ -Pt (SCN) }Mn(L 2 6 4 )(solv)]
and [(L4 )Mn{μ -Pt(SCN) }Mn(L 2 6 4 )] , solv = H O or CH OH.
n 2 3
The compounds were characterized by elemental analysis,
single-crystal X-ray analysis, SQUID magnetic measurements and
infrared spectroscopy.
Magnetic data indicate that either a weak antiferromagnetic
or ferromagnetic exchange interaction is present in the prepared
complexes depending on the type of the exchange pathway. The
magnetic interactions can be realized by several different ways in
general, the covalent or non-covalent pathways are discussed
within the presentation.
Acknowledgements: The financial support from the projects
P207/11/0841, CZ.1.05/2.1.00/03.0058, CZ.1.07/2.3.00/20.0017
and PrF_2012_009 is gratefully acknowledged.
references:
1. H. Miyasak, A. Saitoh,S. Abe, Coord. Chem. Rev. 2007,
251, 2622-2664.
2. S. Wang, X. Ding, Y. Li., W. Huang, Coord. Chem. Rev.
2012, 256, 439-464.
Keywords: manganese complexes; antiferromagnetic
interaction; ferromagnetic interaction;
4 th EucheMs chemistry congress
P - 0 1 4 7
StruCturAL ChArACterizAtion of two ni(ii)
CoMPLexeS BASed on 2-AMinoMethyLPyridine
And tetrACyAnidoMetALAte(2-) AnionS
J. KuChAr 1 , z. viLCeKovA 1 , J. CernAK 1
1 Pavol Jozef Safarik University in Kosice, Faculty of Science,
Kosice, Slovak Republic
As a continuation of our previous studies on molecular
magnets based on Ni(II) and cyanidometallate(2-) anions [1,2] we
have from the aqueous systems Ni(II)–ampy–[M(CN) ] 4 2– (ampy
= 2-aminomethylpyridine, M = Ni(II) and Pd(II)) isolated and
characterized two novel complexes exhibiting compositions
[Ni(ampy) ][Ni(CN) ]·H O (i) and [Ni(ampy) ][Pd(CN) ]·H O
3 4 2 3 4 2
(ii). Both crystal structures of i and ii are ionic and are formed
by [Ni(ampy) ] 3 2+ cations, [M(CN) ] 4 2- (M = Ni(II) and Pd(II))
anions and water molecules of crystallization. The paramagnetic
Ni(II) central atoms exhibits deformed octahedral coordination
with amine groups occupying fac positions in the octahedron and
M atoms within the anions exhibits usual square coordination. In
both i and ii the hydrogen bonds of the N-H···O and O-H···N
types link complex cations, complex anions and water molecules
forming hydrogen bonded layers. Additionally, these hydrogen
bonded layers are linked by π-π interactions forming a 3D
supramolecular arrangement. The temperature variable
susceptibility (2-300 K) and magnetization studies suggest the
presence of weak antiferomagnetic interactions and/or single ion
anisotropy.
Acknowledgement: This work was supported by grant VEGA
1/0089/09.
references:
1. Kuchár, J., Cernák, J., Massa, W.: Acta Cryst., C62 (2006)
m337-m339.
2. Paharová, J., Cernák, J., Boca, R., Îák, Z.: Inorg. Chim.
Acta 346 (2003) 25-31.
Keywords: nickel(II); hydrogen bonds; cyanido complexes;
magnetic properties;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc