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• W1989177592 abstract "A novel series of pseudohalide- ( N 3 - NCS − ) and perchlorato–Cu(II) complexes possessing a series of ligands with pyridyl-containing donors have been investigated. These include [Cu(pmap)ClO 4 )]ClO 4 ( 1 ), [Cu(pmap)(N 3 )]ClO 4 ( 2 ), [Cu(pmea)(N 3 )]ClO 4 ·H 2 O ( 3 ), [Cu(dp-pa)(N 3 )]ClO 4 ·½H 2 O ( 4 ), [Cu(pzdepy)ClO 4 ]ClO 4 ( 5 ), [Cu(pzdepy)(NCS)]ClO 4 ( 6 ) and [Cu 2 (L)(NCS) 4 ]·2CH 3 CN ( 7 ) where pmap = bis[2-(2-pyridylethyl)]-(2-pyridylmethyl)amine, pmea = bis(2-pyridylmethyl)-2-(2-pyridylethyl)amine, dp-pa = N -propanamide- N , N -bis(2-pyridylmethyl)amine, pzdepy = N , N ′-bis[2-(2-pyridylethyl)]piperazine and L = 3,5-bis[bis(2-pyridylmethyl)aminomethyl]-toluene. All complexes were characterized by elemental analyses, IR and UV–Visible spectroscopy. The visible spectra of all complexes reveal the square-pyramidal geometries (SP) around the central Cu 2+ ion. IR spectra confirmed the coordination of the ClO 4 - group in 1 and 5 and the N-donor thiocyanate group in complexes 6 and 7 . The X-ray structure determination of the pseudohalide complexes 2 , 6 and 7 confirmed the monodentate coordination nature of N 3 - and NCS − ions. The structure of 2 or 6 consists of isolated [Cu(pmap)(N 3 )] + or [Cu(pzdepy)(NCS)] + cations and perchlorate counter anions. The copper centers are penta-coordinated by the four N atoms of the pmap or pzdepy and N(5) atom of the azide group in 2 and the thiocyanate group in 6 . In the dinuclear unit [Cu 2 (L)(NCS) 4 ] of 7 , each copper atom forms bonds to three nitrogen atoms of the ligand L, [Cu N bonds from 2.013(2) to 2.054(2) Å], and to N(4) and N(5) atoms of the two terminal thiocyanato groups [Cu(1) N(4) = 1.954(2) Å; Cu(1) N(5) = 2.178(2) Å]. The intradimer Cu(1)...Cu(1A) distance is 5.7010(14) Å. An intramolecular π–π stacking with a ring–ring separation of 3.5991(14) Å is observed between the central benzene ring and the pyridyl rings. In the three complexes ( 2 , 6 and 7 ), the CuN 5 chromophore may be described as an axially elongated square pyramid." @default.
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• W1989177592 date "2009-02-01" @default.
• W1989177592 modified "2023-10-13" @default.
• W1989177592 title "Pseudohalide copper(II) complexes derived from polypyridyl ligands: Synthesis and characterization" @default.
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• W1989177592 doi "https://doi.org/10.1016/j.molstruc.2008.09.015" @default.
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