TY - JOUR
T1 - Homo and heterometallic rhomb-like Ni4 and Mn2Ni 2 complexes
AU - Modak, Ritwik
AU - Sikdar, Yeasin
AU - Mandal, Senjuti
AU - Gómez-García, Carlos J.
AU - Benmansour, Samia
AU - Chatterjee, Sudipta
AU - Goswami, Sanchita
N1 - Funding Information:
Financial support from the University Grants Commission for RFSMS fellowship (Sanction No. UGC/740/RFSMS) to R. Modak and junior research fellowship to S. Mandal [Sanction No. UGC/749/Jr. Fellow(Sc.)] is gratefully acknowledged. We thank DST for a junior research fellowship to Y. Sikdar (Sanction No. SR/FT/CS-107/2011). DST-FIST is acknowledged for providing the X-ray diffraction facility at the Department of Chemistry, University of Calcutta. We also acknowledge the Spanish MINECO (project CTQ2011-26507) and the GeneralidadValenciana (Prometeo2009/095 and ISIC programs) for financial support. Thanks are given to the Consejo Superior de Investigaciones Cientifícas (CSIC) of Spain for the award of a license for the use of the Cambridge Crystallographic Data Base (CSD).
PY - 2014/3/9
Y1 - 2014/3/9
N2 - Two new polynuclear complexes with hydroxyl-rich Schiff base ligand 3-[(2-Hydroxy-benzylidene)-amino]-propane-1,2-diol (H3L), namely [NiII2(HL)(H2L)(SCN)]2·DMF (1) and [MnIII2NiII2(HL) 2(L)2] (2) have been synthesized and characterized by single crystal X-ray diffraction, elemental analyses, FTIR, UV-Vis spectroscopy and variable temperature magnetic susceptibility measurements. The X-ray refinements reveal that both compounds present defective rhomb-like dicubane central cores (Ni4 in 1 and Mn2Ni2 in 2). Magnetic susceptibility measurements indicate the presence of overall antiferromagnetic exchange interactions in 1 along the side connected by a N and O atoms (J1 = -43.6 cm-1) and along the short diagonal of the rhomb (J3 = -3.9 cm-1) and a weak ferromagnetic coupling (J2 = +5.8 cm-1) along the side of the rhomb connected by a double O-bridge. In 2 the three exchange interactions are negative (J1 = J2 = -0.3 cm-1 and J3 = -0.7 cm-1). A magneto-structural correlation with the ratio between the Ni-O-Mn bond angle and the Mn-O bond length is also discussed for double O-bridged Mn-Ni pairs.
AB - Two new polynuclear complexes with hydroxyl-rich Schiff base ligand 3-[(2-Hydroxy-benzylidene)-amino]-propane-1,2-diol (H3L), namely [NiII2(HL)(H2L)(SCN)]2·DMF (1) and [MnIII2NiII2(HL) 2(L)2] (2) have been synthesized and characterized by single crystal X-ray diffraction, elemental analyses, FTIR, UV-Vis spectroscopy and variable temperature magnetic susceptibility measurements. The X-ray refinements reveal that both compounds present defective rhomb-like dicubane central cores (Ni4 in 1 and Mn2Ni2 in 2). Magnetic susceptibility measurements indicate the presence of overall antiferromagnetic exchange interactions in 1 along the side connected by a N and O atoms (J1 = -43.6 cm-1) and along the short diagonal of the rhomb (J3 = -3.9 cm-1) and a weak ferromagnetic coupling (J2 = +5.8 cm-1) along the side of the rhomb connected by a double O-bridge. In 2 the three exchange interactions are negative (J1 = J2 = -0.3 cm-1 and J3 = -0.7 cm-1). A magneto-structural correlation with the ratio between the Ni-O-Mn bond angle and the Mn-O bond length is also discussed for double O-bridged Mn-Ni pairs.
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U2 - 10.1016/j.poly.2013.12.031
DO - 10.1016/j.poly.2013.12.031
M3 - Article
AN - SCOPUS:84893102119
SN - 0277-5387
VL - 70
SP - 155
EP - 163
JO - Polyhedron
JF - Polyhedron
ER -