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- W2121551277 abstract "Abstract Two new bis(N,O‐bidentate) Schiff base ligands with asymmetric spacers between the donor sites have been synthesized. The asymmetric ligand H 2 L 1 self‐assembles with copper(II) ions to give rise to a dinuclear copper(II) complex [Cu 2 L 1 2 ] ( 1 ), while a more flexible ligand H 2 L 2 , having an additional methylene group in the spacer, forms a tetranuclear copper(II) cluster [Cu 4 L 2 4 ] ( 2 ). Both complexes have been characterized by different analytical and spectroscopic techniques. Single‐crystal X‐ray diffraction study of 1 shows a dinuclear copper(II) double‐stranded helicate with the two heterotopic ligands oriented head‐to‐head (HH), with a separation of 7.687(3) Å between the distorted tetrahedral copper(II) centers. The bis(bidentate) ligand strands wrap around the copper centers with a similar relative orientation (HH) to give rise to a double‐helical structure. The intramolecular face‐to‐face π–π interaction stabilizes the double‐helical structure of the molecule. In the tetranuclear complex 2 , the four copper(II) centers, separated by 7.288(2)–8.239(2) Å, define a slightly distorted tetrahedron.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)" @default.
- W2121551277 created "2016-06-24" @default.
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- W2121551277 date "2008-12-01" @default.
- W2121551277 modified "2023-09-30" @default.
- W2121551277 title "Effect of Ligand Spacer on Metallosupramolecular Architectures: From a Dinuclear Copper(II) Double Helicate to a Tetranuclear Copper(II) Complex" @default.
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- W2121551277 doi "https://doi.org/10.1002/ejic.200800817" @default.
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