Copper " II # complexes of two new oxamidate bis
نویسنده
چکیده
Two novel symmetrical bis!tetradentate Schi} base ligands\ H1L and H3L\ have been prepared from the condensation of N\N?!bis"2!aminopropyl#oxamide with pyridine!1!carbaldehyde and pyrrol!1!car! baldehyde\ respectively[ The ligands react with copper"II# nitrate in basic medium to yield the dinuclear complexes ðCu1LŁ"NO2#1 and ðCu1LŁ[ ðCu1LŁ"NO2#1 reacts with sodium azide to yield the neutral dinuclear complex ðCu1L"N2#1Ł\ which was structurally characterized by X!ray di}raction[ The complex crystallizes in the monoclinic system\ space group P10:c with cell constants ] a 6[805"1# Aý\ c 19[009"3# Aý\ b 84[19"2#>\ V 0144[3"3# Aý\ Z 1[ The structure consists of neutral quasi!planar centrosymmetric dinuclear copper"II# molecules\ where two crystallographically equivalent copper"II# ions are bridged by an oxamidate group in trans conformation\ resulting in a copper!copper distance of 4[160 Aý[ Each copper"II# ion occupies the N2O inner site of the doubly!deprotonated L ligand with bond distances of ca 1[9 Aý\ whereas a nitrogen atom from the azide group completes the coordination polyhedron with a longer bond distance of 1[239"3# Aý[ All the dinuclear complexes exhibited strong antiferromagnetic exchange interaction[ The magnetic data were analyzed by using the Bleaney!Bowers equation "H −JS0S1# leading to singlet!triplet energy values "J# of 314[4 cm for ðCu1LŁ"NO2#1\ 316[8 cm for ðCu1LŁ and 313[0 cm for ðCu1"L#"N2#1Ł[ These J values are a consequence of the ability of the oxamidate!bridge to propagate the antiferromagnetic exchange interaction between metal ions which allow a large overlap of the dx1−y1 magnetic orbitals centered on each copper"II# ion[ Þ 0887 Elsevier Science Ltd[ All rights reserved
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