Publication Type Journal Article
Title Syntheses, Structures and Magnetic Properties of Trinuclear (CuMCuII)-M-II-Cu-II (M = Cu, Ni, Co and Fe) and Tetranuclear [2x1+1x 2] (CuMnII)-Mn-II-2Cu(II) Complexes Derived from a Compartmental Ligand: The Schiff Base 3-Methoxysalicylaldehyde Diamin
Authors Arpita Biswas Meenakshi Ghosh Pascale Lemoine Sohini Sarkar Susanta Hazra Sasankasekhar Mohanta
Groups
Journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Year 2010
Month July
Volume
Number 20
Pages 3125-3134
Abstract The present investigation describes syntheses, characterization and studies of the mononuclear compound [(CuLC)-L-II (H2O)] (1), the triangular, trinuclear monophenoxido-bridged compounds [\(CuL)-L-II\(2)Mn-II(H2O)(2)](ClO4)(2)center dot nH(2)O [2 (M = Cu, n = 0), 3 (M = Ni, n = 3), 4 (M = Co, n = 0), 5 (M = Fe, n = 0)] and the tetrametallic self-assembled complex [\(CuLMnII)-L-II(H2O)(3)]-\(CuL)-L-II)(2)](ClO4)(2)center dot H2O (6) derived from compartmental Schiff base ligand, H2L, which is the [2+1] condensation product of 3-methoxysalicylaldehyde and trans-1,2-diaminocyclohexane. Single-crystal X-ray structures of 2, 5 and 6 were determined. Two pairs of terminal center dot center dot center dot central metal ions in the trinuclear cores in 2 and 5 are monophenoxido-bridged. Interestingly, the CuO6 and FeO6 environments have tetragonally compressed octahedral geometries. On the other hand, the structure of 6 reveals that it is a [2X1+1x2] cocrystal of one diphenoxido-bridged dinuclear [(CuLMnII)-L-II(H2O)(3)](2+) dication and two mononuclear [(CuL)-L-II] moieties. Cocrystallization in 6 takes place as a result of water encapsulation. The variable-temperature (2-300 K) magnetic susceptibilities of compounds 2-6 have been measured. The exchange integrals obtained are: the Cu-3(II) compound 2, J = -78.9 cm(-1); the (CuNiCuII)-Ni-II-Cu-II compound 3, J = -22.8 cm(-1); the (CuCoCuII)-Co-II-Cu-II compound 4, J = -7.8 cm(-1); the (CuFeCuII)-Fe-II-Cu-II compound 5, J = -3.0 cm(-1); the (Cu3MnII)-Mn-II compound 6, J = -15.1 cm(-1). The monophenoxido-bridging core in 3 and 4 has been proposed after comparison of the structures and magnetic properties of these two compounds with those of 2, 5 and related other compounds. This paper presents rare examples of monophenoxido-bridged (CuMCuII)-M-II-Cu-II (M = Cu, Ni, Co and Fe) compounds, provides an understanding of the structures from magnetic exchange integrals, and, most importantly, reports on the first example of a cocrystal derived from a 3-methoxysalicylaldehyde diamine compartmental ligand.
DOI http://dx.doi.org/10.1002/ejic.201000050
ISBN
Publisher
Book Title
ISSN 1434-1948
EISSN 1099-0682
Conference Name
Bibtex ID ISI:000280428600007
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