Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N2O and N2O2 donor sets: Syntheses, structural variations, EPR and DNA binding studies

Aurkie Ray; Georgina M. Rosair; Ramakant Kadam; Samiran Mitra

doi:10.1016/j.poly.2008.12.040

Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N₂O and N₂O₂ donor sets: Syntheses, structural variations, EPR and DNA binding studies

Aurkie Ray
, Georgina M. Rosair
, Ramakant Kadam
, Samiran Mitra

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

82 Citations (Scopus)

Abstract

Three new mono-di-trinuclear cobalt complexes of three different Schiff bases have been synthesised. In all the three complexes psuedohalides (NCO^- and N₃^-) have been incorporated to generate structural variation. Of the three Schiff bases, HL¹ and HL² were obtained by selective condensation of two different 1,3-diamines with 2-hydroxyacetophenone and H₂L³ resulted from non-selective condensation of 1,3-diamine with 2-hydroxyacetophenone. Only one -NH₂ functionality of 1,3-diaminopropane and 1,3-diaminopentane was selectively condensed with 2-hydroxyacetophenone to generate Schiff bases HL¹ and HL², respectively. H₂L³ was obtained by condensing both the amine functionality of 1,3-diaminopropane with 2-hydroxyacetophenone. Therefore HL¹ and HL² behave as a N₂O donors, whereas H₂L³ provides a N₂O₂ donor coordination environment for the cobalt ions in the respective complexes. In [Co(L¹)₂]₂ [Co(NCO)₄] (1) the asymmetric unit comprises of five mononuclear cobalt centers, [Co₂(µ-N₃)₂(L²)₂(N₃)₂] (2) is a dinuclear and [(H₂O)₂Co(µ-N₃)₂(µ-L³)₂Co₂(N₃)_1.25(CH₃O)_0.75] · H₂O (3) is a trinuclear cobalt species. The three complexes have been characterised using IR, UV-Vis spectroscopy and cyclic voltammetry. Structural aspects of 1, 2 and 3 have been described by performing single crystal X-ray analysis. EPR analyses of 1 and 3, and DNA binding abilities of all three cobalt complexes have been studied in detail. © 2009 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	796-806
Number of pages	11
Journal	Polyhedron
Volume	28
Issue number	4
DOIs	https://doi.org/10.1016/j.poly.2008.12.040
Publication status	Published - 12 Mar 2009

Keywords

Cobalt
Crystal structures
DNA binding
EPR
Mono-di-trinuclear
Selectively and non-selectively condensed Schiff bases

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10.1016/j.poly.2008.12.040

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@article{52e0805fe6414d8c99812cddbe90e7d7,

title = "Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N2O and N2O2 donor sets: Syntheses, structural variations, EPR and DNA binding studies",

abstract = "Three new mono-di-trinuclear cobalt complexes of three different Schiff bases have been synthesised. In all the three complexes psuedohalides (NCO- and N3-) have been incorporated to generate structural variation. Of the three Schiff bases, HL1 and HL2 were obtained by selective condensation of two different 1,3-diamines with 2-hydroxyacetophenone and H2L3 resulted from non-selective condensation of 1,3-diamine with 2-hydroxyacetophenone. Only one -NH2 functionality of 1,3-diaminopropane and 1,3-diaminopentane was selectively condensed with 2-hydroxyacetophenone to generate Schiff bases HL1 and HL2, respectively. H2L3 was obtained by condensing both the amine functionality of 1,3-diaminopropane with 2-hydroxyacetophenone. Therefore HL1 and HL2 behave as a N2O donors, whereas H2L3 provides a N2O2 donor coordination environment for the cobalt ions in the respective complexes. In [Co(L1)2]2 [Co(NCO)4] (1) the asymmetric unit comprises of five mononuclear cobalt centers, [Co2(µ-N3)2(L2)2(N3)2] (2) is a dinuclear and [(H2O)2Co(µ-N3)2(µ-L3)2Co2(N3)1.25(CH3O)0.75] · H2O (3) is a trinuclear cobalt species. The three complexes have been characterised using IR, UV-Vis spectroscopy and cyclic voltammetry. Structural aspects of 1, 2 and 3 have been described by performing single crystal X-ray analysis. EPR analyses of 1 and 3, and DNA binding abilities of all three cobalt complexes have been studied in detail. {\textcopyright} 2009 Elsevier Ltd. All rights reserved.",

keywords = "Cobalt, Crystal structures, DNA binding, EPR, Mono-di-trinuclear, Selectively and non-selectively condensed Schiff bases",

author = "Aurkie Ray and Rosair, \{Georgina M.\} and Ramakant Kadam and Samiran Mitra",

year = "2009",

month = mar,

day = "12",

doi = "10.1016/j.poly.2008.12.040",

language = "English",

volume = "28",

pages = "796--806",

journal = "Polyhedron",

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Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N₂O and N₂O₂ donor sets: Syntheses, structural variations, EPR and DNA binding studies. / Ray, Aurkie; Rosair, Georgina M.; Kadam, Ramakant et al.
In: Polyhedron, Vol. 28, No. 4, 12.03.2009, p. 796-806.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N2O and N2O2 donor sets

T2 - Syntheses, structural variations, EPR and DNA binding studies

AU - Ray, Aurkie

AU - Rosair, Georgina M.

AU - Kadam, Ramakant

AU - Mitra, Samiran

PY - 2009/3/12

Y1 - 2009/3/12

N2 - Three new mono-di-trinuclear cobalt complexes of three different Schiff bases have been synthesised. In all the three complexes psuedohalides (NCO- and N3-) have been incorporated to generate structural variation. Of the three Schiff bases, HL1 and HL2 were obtained by selective condensation of two different 1,3-diamines with 2-hydroxyacetophenone and H2L3 resulted from non-selective condensation of 1,3-diamine with 2-hydroxyacetophenone. Only one -NH2 functionality of 1,3-diaminopropane and 1,3-diaminopentane was selectively condensed with 2-hydroxyacetophenone to generate Schiff bases HL1 and HL2, respectively. H2L3 was obtained by condensing both the amine functionality of 1,3-diaminopropane with 2-hydroxyacetophenone. Therefore HL1 and HL2 behave as a N2O donors, whereas H2L3 provides a N2O2 donor coordination environment for the cobalt ions in the respective complexes. In [Co(L1)2]2 [Co(NCO)4] (1) the asymmetric unit comprises of five mononuclear cobalt centers, [Co2(µ-N3)2(L2)2(N3)2] (2) is a dinuclear and [(H2O)2Co(µ-N3)2(µ-L3)2Co2(N3)1.25(CH3O)0.75] · H2O (3) is a trinuclear cobalt species. The three complexes have been characterised using IR, UV-Vis spectroscopy and cyclic voltammetry. Structural aspects of 1, 2 and 3 have been described by performing single crystal X-ray analysis. EPR analyses of 1 and 3, and DNA binding abilities of all three cobalt complexes have been studied in detail. © 2009 Elsevier Ltd. All rights reserved.

AB - Three new mono-di-trinuclear cobalt complexes of three different Schiff bases have been synthesised. In all the three complexes psuedohalides (NCO- and N3-) have been incorporated to generate structural variation. Of the three Schiff bases, HL1 and HL2 were obtained by selective condensation of two different 1,3-diamines with 2-hydroxyacetophenone and H2L3 resulted from non-selective condensation of 1,3-diamine with 2-hydroxyacetophenone. Only one -NH2 functionality of 1,3-diaminopropane and 1,3-diaminopentane was selectively condensed with 2-hydroxyacetophenone to generate Schiff bases HL1 and HL2, respectively. H2L3 was obtained by condensing both the amine functionality of 1,3-diaminopropane with 2-hydroxyacetophenone. Therefore HL1 and HL2 behave as a N2O donors, whereas H2L3 provides a N2O2 donor coordination environment for the cobalt ions in the respective complexes. In [Co(L1)2]2 [Co(NCO)4] (1) the asymmetric unit comprises of five mononuclear cobalt centers, [Co2(µ-N3)2(L2)2(N3)2] (2) is a dinuclear and [(H2O)2Co(µ-N3)2(µ-L3)2Co2(N3)1.25(CH3O)0.75] · H2O (3) is a trinuclear cobalt species. The three complexes have been characterised using IR, UV-Vis spectroscopy and cyclic voltammetry. Structural aspects of 1, 2 and 3 have been described by performing single crystal X-ray analysis. EPR analyses of 1 and 3, and DNA binding abilities of all three cobalt complexes have been studied in detail. © 2009 Elsevier Ltd. All rights reserved.

KW - Cobalt

KW - Crystal structures

KW - DNA binding

KW - EPR

KW - Mono-di-trinuclear

KW - Selectively and non-selectively condensed Schiff bases

UR - https://www.scopus.com/pages/publications/60349095833

U2 - 10.1016/j.poly.2008.12.040

DO - 10.1016/j.poly.2008.12.040

M3 - Article

SN - 0277-5387

VL - 28

SP - 796

EP - 806

JO - Polyhedron

JF - Polyhedron

IS - 4

ER -

Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N₂O and N₂O₂ donor sets: Syntheses, structural variations, EPR and DNA binding studies

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Keywords

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