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• W2087125306 abstract "Abstract A systematic investigation of the 1:2:1:2 Cu(NO 3 ) · 2.5H 2 O/H 2 L/bpy/LiOH · H 2 O (H 2 L = maleamic acid) reaction system in MeCN/H 2 O was carried out. The compounds [Cu 2 (HL) 2 (bpy) 2 (H 2 O) 2 ](NO 3 ) 2 ( 1 ), [Cu 2 (HL) 2 (bpy) 2 (H 2 O) 2 ](NO 3 ) 2 · 2H 2 O ( 1· 2H 2 O), [Cu 2 Li 2 (L′) 2 (bpy) 2 (H 2 O) 6 ][Cu 2 (HL) 2 (bpy) 2 (H 2 O) 2 ](NO 3 ) 4 ( 2 ), [Cu 4 (L′) 2 (NO 3 ) 2 (bpy) 4 (H 2 O) 2 ](NO 3 ) 2 · 2H 2 O ( 3· 2H 2 O) and [Cu(L′)(bpy)] n · 2 n H 2 O ( 4· 2 n H 2 O) were isolated, depending on the crystallization method employed. Complexes 2 , 3· 2H 2 O and 4· 2 n H 2 O contain the maleate(–2) anion (L′ 2– ), which was formed in situ through metal‐ion‐assisted hydrolysis of the primary amide group of H 2 L. Efforts to prepare complex 3 from the direct use of maleic acid (H 2 L′) afforded compounds 4· 2 n H 2 O, [Cu 4 (L′) 2 (NO 3 ) 2 (bpy) 4 (H 2 O) 2 ](NO 3 ) 2 · 2[Li(NO 3 )(H 2 O) 3 ] · 4H 2 O ( 5· 4H 2 O) and [Cu(NO 3 )(bpy)(H 2 O) 3 ](NO 3 ) ( 6 ) from the 1:1:1:2 Cu(NO 3 ) · 2.5H 2 O/H 2 L′/bpy/LiOH · H 2 O reaction system in MeCN/H 2 O. The maleamate(–1) ligand presents the less common η 1 :μ 2 coordination mode in the cations of 1 , 1· 2H 2 O and 2 . The maleate(–2) ligand exhibits the η 1 :η 1 :η 1 :η 1 :μ 3 coordination mode in the [Cu II 4 ] cations of 3· 2H 2 O and 5· 4H 2 O and in the [Cu II 2 Li I 2 ] heterometallic cation of 2 . The crystal structures of the complexes are stabilized by various H‐bonding patterns. Characteristic IR bands of the complexes are discussed in terms of the known structures and the coordination modes of the ligands. Magnetic susceptibility measurements for 3· 2H 2 O reveal weak ferromagnetic interactions along the periphery of the Cu 4 rhombus ( J = 3.3 cm –1 , –2 J ij S i S j Hamiltonian formalism), which stabilizes an S = 2 ground state. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
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• W2087125306 date "2009-10-01" @default.
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• W2087125306 title "Maleamate(-1) and Maleate(-2) Copper(II)-2,2′-Bipyridine Complexes: Synthesis, Reactivity and Structural and Physical Studies" @default.
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• W2087125306 doi "https://doi.org/10.1002/ejic.200900485" @default.
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