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Syntheses, Crystal Structure and Magnetic Properties of an Unprecedented One‐Dimensional Coordination Polymer Derived from an {(NiL) 2 Ln} Node and a Pyrazine Spacer (H 2 L= N,N ′‐Bis(salicylidene)‐1,3‐propanediamine, Ln=Gd, Tb and Dy)
Author(s) -
Ghosh Soumavo,
Mahapatra Prithwish,
Kanetomo Takuya,
Drew Michael G. B.,
Ishida Takayuki,
Ghosh Ashutosh
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600637
Subject(s) - pyrazine , crystallography , lanthanide , magnetization , magnetic susceptibility , square antiprism , ligand (biochemistry) , ferromagnetism , coordination polymer , chemistry , zigzag , materials science , phase (matter) , ferrimagnetism , molecule , crystal structure , stereochemistry , ion , condensed matter physics , magnetic field , physics , geometry , mathematics , organic chemistry , quantum mechanics , biochemistry , receptor
In order to investigate the coordinative interaction of the [Ni II L] metalloligand with lanthanides (H 2 L = N,N ′‐bis(salicylidene)‐1,3‐propanediamine or H 2 salpn) and the building block potential of the resultant unstable {(Ni II L) 2 Ln III } (Ln III =Lanthanides) complex with a short spacer pyrazine (pyz), three heterometallic coordination polymers of formulae [{(NiL) 2 Ln(NO 3 ) 3 }pyz] n ⋅1.5nH 2 O [Ln=Gd ( 1 ), Tb ( 2 ) and Dy ( 3 )] have been synthesized. In these compounds the central Ln III ion is connected to two terminal [NiL] metalloligands through µ 1,1 ‐diphenoxido bridges to form the trinuclear node with three nitrato coligands (LnO 9 monocapped square‐antiprism). The coordinative preference of pyrazine ligand towards the Ni II ‐centre of the trinuclear units leads to the formation of these tailored 1D‐zigzag coordination polymers with transoid trinuclear nodes. The magnetization at 1.8 K for 1 (10.4 μ B at 7 T) indicates the presence of Gd−Ni ferromagnetic coupling through the phenoxido bridges. The exchange parameter was determined to be +0.179(4) K from the magnetic susceptibility measurement. Both in‐phase and out‐of‐phase ac magnetic measurements under an applied dc magnetic field reveal temperature dependence of the susceptibility at different frequencies below 5 K for compound 3 , characteristic of single molecule magnets (SMMs) or polymeric aggregates of SMMs.