Juan Costamagna | Universidad de Santiago de Chile (original) (raw)
Uploads
Papers by Juan Costamagna
Journal of Coordination Chemistry, 2003
This special issue is devoted to an important area of coordination chemistry – azamacrocyclic lig... more This special issue is devoted to an important area of coordination chemistry – azamacrocyclic ligands and their metal complexes, with many applications in theoretical chemistry, biology, medicine, and industry. Despite the fact that such compounds have been covered in recent reviews, monographs and comprehensive issues on coordination and supramolecular chemistry, we believe that this issue, containing the latest experimental achievements in this field, will be useful for readers.
[Cu(C 14 H 10 Br 2 NO) 2 ] cristallise dans P2 1 /n avec a=17,866, b=21,963, c=14,128 A, β=93,16;... more [Cu(C 14 H 10 Br 2 NO) 2 ] cristallise dans P2 1 /n avec a=17,866, b=21,963, c=14,128 A, β=93,16; Z=8, affinement jusqu'a R=0,076. Les deux molecules independantes cristallographiquement ont des coordinations planes deformees presque identiques autour des atomes Cu. Les angles entre les deux plans de coordination definis par O1−Cu−N et O2−Cu−N2 sont 33,4 et 33,7 o pour respectivement les molecules 1 et 2. Les angles des liaisons principales N−Cu−N et N−Cu−O sont 155,0 et 92,5 o et les longueurs des liaisons principales Cu−N et Cu−O sont respectivement 1,963 et 1,885 A. Il n'y a pas d'interaction entre les atomes Cu
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 22, 2018
A family of six homoleptic [CuI(Ln)]2(ClO4)2 and six heteroleptic [CuI(Ln)(PPh3)2]2(ClO4)2 bimeta... more A family of six homoleptic [CuI(Ln)]2(ClO4)2 and six heteroleptic [CuI(Ln)(PPh3)2]2(ClO4)2 bimetallic complexes, where Ln are bis-Schiff base ligands with alkyl spacers of variable length (n= 2-7 -CH2-), were prepared to evaluate the role of the spacer on the formation of helicates or mesocates. In the homoleptic series, spectroscopic and theoretical studies indicate that preferences for a conformation are based on energetic parameters, mainly, the establishment of non-covalent interactions. The odd-even nature of the spacers pre-conditions the superposition of the aromatic rings to allow the juxtaposition necessary for non-covalent interactions, while the increase of the length reduces the strength of such interactions. Consequently, complexes with even-spacers of short length were identified as helicates in solution, [CuI(Ln)]22+ (n=2,4). Complexes [CuI(Ln)]22+ (n=3-7) dissociate in solution to produce the monometallic complexes in equilibrium, [CuI(Ln)]+. The stability of the bim...
Http Dx Doi Org 10 1080 00958970310001624276, May 12, 2010
Electroanalysis, Aug 8, 2001
Transition Metal Chemistry, 1986
Http Dx Doi Org 10 1080 00958970310001624447, May 12, 2010
Journal of Coordination Chemistry, 2001
Contribuciones De Dicyt, Jul 7, 2014
Journal of Coordination Chemistry, 2003
This special issue is devoted to an important area of coordination chemistry – azamacrocyclic lig... more This special issue is devoted to an important area of coordination chemistry – azamacrocyclic ligands and their metal complexes, with many applications in theoretical chemistry, biology, medicine, and industry. Despite the fact that such compounds have been covered in recent reviews, monographs and comprehensive issues on coordination and supramolecular chemistry, we believe that this issue, containing the latest experimental achievements in this field, will be useful for readers.
[Cu(C 14 H 10 Br 2 NO) 2 ] cristallise dans P2 1 /n avec a=17,866, b=21,963, c=14,128 A, β=93,16;... more [Cu(C 14 H 10 Br 2 NO) 2 ] cristallise dans P2 1 /n avec a=17,866, b=21,963, c=14,128 A, β=93,16; Z=8, affinement jusqu'a R=0,076. Les deux molecules independantes cristallographiquement ont des coordinations planes deformees presque identiques autour des atomes Cu. Les angles entre les deux plans de coordination definis par O1−Cu−N et O2−Cu−N2 sont 33,4 et 33,7 o pour respectivement les molecules 1 et 2. Les angles des liaisons principales N−Cu−N et N−Cu−O sont 155,0 et 92,5 o et les longueurs des liaisons principales Cu−N et Cu−O sont respectivement 1,963 et 1,885 A. Il n'y a pas d'interaction entre les atomes Cu
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 22, 2018
A family of six homoleptic [CuI(Ln)]2(ClO4)2 and six heteroleptic [CuI(Ln)(PPh3)2]2(ClO4)2 bimeta... more A family of six homoleptic [CuI(Ln)]2(ClO4)2 and six heteroleptic [CuI(Ln)(PPh3)2]2(ClO4)2 bimetallic complexes, where Ln are bis-Schiff base ligands with alkyl spacers of variable length (n= 2-7 -CH2-), were prepared to evaluate the role of the spacer on the formation of helicates or mesocates. In the homoleptic series, spectroscopic and theoretical studies indicate that preferences for a conformation are based on energetic parameters, mainly, the establishment of non-covalent interactions. The odd-even nature of the spacers pre-conditions the superposition of the aromatic rings to allow the juxtaposition necessary for non-covalent interactions, while the increase of the length reduces the strength of such interactions. Consequently, complexes with even-spacers of short length were identified as helicates in solution, [CuI(Ln)]22+ (n=2,4). Complexes [CuI(Ln)]22+ (n=3-7) dissociate in solution to produce the monometallic complexes in equilibrium, [CuI(Ln)]+. The stability of the bim...
Http Dx Doi Org 10 1080 00958970310001624276, May 12, 2010
Electroanalysis, Aug 8, 2001
Transition Metal Chemistry, 1986
Http Dx Doi Org 10 1080 00958970310001624447, May 12, 2010
Journal of Coordination Chemistry, 2001
Contribuciones De Dicyt, Jul 7, 2014