title: Decanuclear Ln10 Wheels and Vertex-Shared Spirocyclic Ln5 Cores: Synthesis, Structure, SMM Behavior, and MCE Properties.
abstract: The reaction of a Schiff base ligand (LH3) with lanthanide salts, pivalic acid and triethylamine in 1:1:1:3 and 4:5:8:20 stoichiometric ratios results in the formation of decanuclear Ln10 (Ln = Dy (1), Tb (2), and Gd (3)) and pentanuclear Ln5 complexes (Ln = Gd (4), Tb (5), and Dy (6)), respectively. The formation of Ln10 and Ln5 complexes are fully governed by the stoichiometry of the reagents used. Detailed magnetic studies on these complexes (1-6) have been carried out. Complex 1 shows a SMM behavior with an effective energy barrier for the reversal of the magnetization (Ueff) = 16.12(8) K and relaxation time (τo) = 3.3×10(-5) s under 4000 Oe direct current (dc) field. Complex 6 shows the frequency dependent maxima in the out-of-phase signal under zero dc field, without achieving maxima above 2 K. Complexes 3 and 4 show a large magnetocaloric effect with the following characteristic values: -ΔSm = 26.6 J kg(-1) K(-1) at T = 2.2 K for 3 and -ΔSm = 27.1 J kg(-1) K(-1) at T = 2.4 K for 4, both for an applied field change of 7 T.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India) http://www.iitk.ac.in.|Department of Emerging Materials Science, DGIST, Daegu 711-873 (Korea) http://www.dgist.ac.kr.
authors.forename: Sourav
authors.initials: S
authors.lastname: Das
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India) http://www.iitk.ac.in.
authors.forename: Atanu
authors.initials: A
authors.lastname: Dey
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India) http://www.iitk.ac.in.
authors.forename: Subrata
authors.initials: S
authors.lastname: Kundu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India) http://www.iitk.ac.in.
authors.forename: Sourav
authors.initials: S
authors.lastname: Biswas
authors.affiliation: National Institute of Science Education and Research, Institute of Physics Campus, Sachivalaya Marg, PO: Sainik School, Bhubaneswar - 751 005 (India) http://www.niser.ac.in.
authors.forename: Ramakirushnan Suriya
authors.initials: RS
authors.lastname: Narayanan
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada (Spain) http://www.ugr.es.
authors.forename: Silvia
authors.initials: S
authors.lastname: Titos-Padilla
authors.affiliation: Instituto de Ciencia de Materiales de Aragón and, Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza (Spain) http://molchip.unizar.es/
authors.forename: Giulia
authors.initials: G
authors.lastname: Lorusso
authors.affiliation: Instituto de Ciencia de Materiales de Aragón and, Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza (Spain) http://molchip.unizar.es/
authors.forename: Marco
authors.initials: M
authors.lastname: Evangelisti
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada (Spain) http://www.ugr.es.
authors.forename: Enrique
authors.initials: E
authors.lastname: Colacio
authors.affiliation: Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016 (India) http://www.iitk.ac.in. vc@iitk.ac.in.|National Institute of Science Education and Research, Institute of Physics Campus, Sachivalaya Marg, PO: Sainik School, Bhubaneswar - 751 005 (India) http://www.niser.ac.in. vc@iitk.ac.in.
authors.forename: Vadapalli
authors.initials: V
authors.lastname: Chandrasekhar
keywords: X-ray diffraction; lanthanide complexes; ligands; macrocycles; magnetic properties