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Syntheses, Structures and Magnetic Properties of Heterobridged Dinuclear and Cubane‐Type Tetranuclear Complexes of Nickel(II) Derived from a Schiff Base Ligand
Author(s) -
Hazra Susanta,
Koner Rajesh,
Lemoine Pascale,
Sañudo E. Carolina,
Mohanta Sasankasekhar
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900353
Subject(s) - cubane , chemistry , triclinic crystal system , crystallography , monoclinic crystal system , nickel , ligand (biochemistry) , schiff base , ground state , stereochemistry , magnetic susceptibility , metal , ferromagnetism , crystal structure , biochemistry , receptor , organic chemistry , physics , quantum mechanics
Syntheses, structures and magnetic properties of a heterobridged μ‐phenoxido‐μ 1,1 ‐NCO dinickel(II) compound [Ni II 2 (HL) 3 (μ‐NCO)] · 2H 2 O ( 1 ) and a heterobridged bis(μ 3 ‐phenoxido)bis(μ 3 ‐alkoxido)tetranickel(II) system, [Ni II 4 (L) 2 (HL) 2 (SeCN) 2 (H 2 O) 2 ] · C 3 H 7 NO · 4H 2 O ( 2 ), containing a cubane‐type Ni II 4 O 4 core, derived from the tetradentate Schiff base compartmental ligand N ‐(2‐hydroxyethyl)‐3‐methoxysalicylaldimine (H 2 L) were described. Compounds 1 and 2 crystallize in triclinic P $\bar {1}$ and monoclinic P 2 1 / c systems, respectively. Compound 2 , in which the Ni 4 O 4 cubane core is composed of two μ 3 ‐phenoxido and two μ 3 ‐alkoxido moieties, represents the sole example of this type. The variable‐temperature (2–300 K) magnetic susceptibilities and magnetizations of these two compounds were measured. The interaction between the metal centres in dinuclear compound 1 is weak ferromagnetic, resulting in an S T = 2 ground state at 2 K. The overall interaction observed in 2 is weak ferromagnetic, leading to an unusual S T = 3 ground state. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)