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New 1,4,7,10-Tetraazacyclotridecane-11,13-dione Ligands appended with Additional Donor(s) 8-Methylquinoline(s): Crystal Structures and Characterization of their Copper(II) Complexes

DOI: 10.1039/DT9950002289

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2289 - 2296 (1995)

Update date:2022-08-16

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Authors:

Bu, Xian HeBu, Xian He

An, Dao LiAn, Dao Li

Chen, Yun TiChen, Yun Ti

Shionoya, MitsuhikoShionoya, Mitsuhiko

Kimura, EiichiKimura, Eiichi

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Article abstract of DOI:10.1039/DT9950002289

Two macrocyclic dioxotetraamine ligands 4-(quinolin-8-ylmethyl)-1,4,7,10-teraazacyclotridecane-11,13-dione (H2L1) and 4,7-bis(quinolin-8-ylmethyl)-1,4,7,10-tetraazacyclotridecane-11,13-dione (H2L2) have been synthesized.The resulting dioxomacrocycles readily co-ordinate Cu(2+) with concomitant double deprotonation of the ligands.The solution behaviour of the copper(II) complexes 1> 1 and 2> 2 has been studied by ESR, UV/VIS and cyclic voltammetric techniques.Remarkable red shifts were observed for the absorption band maxima of the electronic spectra of these copper(II) complexes (598 nm for 1 and 600 nm for 2) in comparison to that of unsubstituted (1,4,7,10-tetraazacyclotridecane-11,13-dione)copper(II) species (516 nm).The crystal structures of 1 and 2 (which crystallised in the form <(CuL2)2>*3H2O*MeCN) have been determined by X-ray diffraction analysis.Crystallographic data: 1, orthorhombic, space group Pcab, a = 16.260(3), b = 7.739(2), c = 27.530(9) Angstroem, Z = 8, R' = 0.061 for 2594 observed reflections with I > 3?(I); 2, triclinic, space group P<*>, a = 12.288(3), b = 14.734(4), c = 18.005(4) Angstroem, α = 102.26(2), β = 104.26(2), γ = 107.02(2) deg, Z = 2, R' = 0.090 for 2284 observed reflections with I > 3?(I).In complex 1, the Cu atom is five-co-ordinate and forms a distorted square pyramid in which N(11) of the quinoline pendant is at the apical site.The Cu-N(11) bond <2.266(3) Angstroem> is longer than the basal Cu-N bond lengths .In complex 2, the Cu(II) centre is also five-co-ordinate, with one of the quinoline pendants co-ordinating to Cu(II) from the apical position and the other pendant remaining unco-ordinated.

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Product name:8-Bromomethylquinoline

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