abstract
A new chiral tetranuclear Ni4O4 complex has been developed with distorted cubane-type structure. The structure was determined by single-crystal X-ray diffraction. The new tetradentate Schiff-base ligand in this compound was synthesized via the condensation of 2 '-hydroxyacetophenone and (R)-3-amino-1,2-propanediol. Temperature dependent magnetization measurements showed a predominant ferromagnetic interaction among the four Ni centers. The best fit of the chi T vs. T curve results in a solution with two exchange interaction values, J(1)=12.7 cm(-1), and J(2)=1.6 cm(-1) which are appreciably correlated with the structure. Ac susceptibility data were collected between 2 and 28 K and it is found that the data display a small frequency dependence with the peaks shifting to higher temperatures with increasing frequencies.
keywords
TETRANUCLEAR CUBANE; MAGNETIC-PROPERTIES; CLUSTER COMPLEXES; NI-4; COORDINATION; CARBOXYLATE; FAMILY; UNITS; DICUBANE; BEHAVIOR
subject category
Chemistry
authors
Sen, R; Lopes, AML; Lin, Z; Brandao, P; Araujo, JP
our authors
Paula Cristina Ferreira da Silva Brandão
Assistant Researcher
Zhi Lin
Principal Researcheracknowledgements
R.S. thanks the DST-SERB for an ECR grant (ECR/2016/001572). This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, and the project Network of Extreme Conditions Laboratories NECL-IFIMUP, NORTE-01-0145-FEDER-022096, financed by national funds through the FCT/MCTES and projects IF/00686/2014, POCI-01-0145-FEDER-029454, POCI-01-0145-FEDER-032527.