A novel copper(II) complex containing the ligand 1,2-bis(2,2'-bipyridyl-6-yl)ethane: structural, magnetic, redox, and spectral properties

Garber, Ty; Wallendael, Shawn Van; Rillema, D. Paul; Kirk, Martin L.; Hatfield, William E.; Welch, J. H.; Singh, Pushpendra

doi:10.1021/ic00340a028

Cited by 55 publications

(42 citation statements)

References 3 publications

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“…[32] For the complex synthesis, two different iron precursors were used. To prepare the complex [Fe(o-bpy)(NCS) 2 ] (1) iron(II) perchlorate was dissolved in methanol and potassium thiocyanate was added.…”

Section: Resultsmentioning

confidence: 99%

“…One axial ligand should fix the complex to a gold surface and the other one should allow further functionalization of the complex. [31] A suitable ligand for such studies has been described by Singh et al [32] This "o-bpy" ligand [o-bpy = 1,2-bis(2,2Ј-bipyridyl-6-yl)ethane] consists of two 2,2Ј-bipyridine units connected by an ethylene bridge and so far has been used to synthesize copper(I) and copper(II) complexes. [32] We decided to synthesize first the complex [Fe(o-bpy)(NCS) 2 ] (1) (Figure 1 left) and to study its magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…[31] A suitable ligand for such studies has been described by Singh et al [32] This "o-bpy" ligand [o-bpy = 1,2-bis(2,2Ј-bipyridyl-6-yl)ethane] consists of two 2,2Ј-bipyridine units connected by an ethylene bridge and so far has been used to synthesize copper(I) and copper(II) complexes. [32] We decided to synthesize first the complex [Fe(o-bpy)(NCS) 2 ] (1) (Figure 1 left) and to study its magnetic properties. Although this compound is closely related to the complex [Fe(bapbpy)(NCS) 2 ] [bapbpy = N- (6-(6-(pyridin-2- (Figure 1 right), which exhibits thermal SCO, [33] we found that compound 1 is paramagnetic till 2 K. In order to drive the system towards SCO behavior, we decided to further prepare the compounds [Fe(o-bpy)(py) 2 ](BPh 4 ) 2 (2) and [Fe(o-bpy)(im) 2 ](BPh 4 ) 2 (3).…”

Section: Introductionmentioning

confidence: 99%

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Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Schmidt

Kisslinger

Würtele

et al. 2013

Zeitschrift anorg allge chemie

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Schmidt

Kisslinger

Würtele

et al. 2013

Zeitschrift anorg allge chemie

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“…All manipulations were performed under aerobic conditions except the synthesis of bis(bipyridine) ligand L, which was carried out as described elsewhere. 13 All chemicals were used as received. [Mn 3 O(O 2 CR) 6 (py) 3 ](ClO 4 ) (R ) Me (1), Et (2), and Ph (3)) were available from previous work.…”

Section: Methodsmentioning

confidence: 99%

Tetranuclear Manganese Complexes with Dimer-of-Dimer and Ladder Structures from the Use of a Bis-Bipyridyl Ligand

et al. 2002

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The reaction of the bis-chelating ligand 1,2-bis(2,2'-bipyridine-6-yl)ethane (L) with the trinuclear species of formula [Mn(3)O(O(2)CR)(6)(py)(3)](ClO(4)) (R = Me (1); R = Et (2); R = Ph (3)) has afforded the new tetranuclear mixed-valent complexes [Mn(4)O(2)(O(2)CR)(4)L(2)](ClO(4))(2) (R = Me (4); R = Et (5); R = Ph (6)) and [Mn(4)O(2)(OMe)(3)(O(2)CR)(2)L(2)(MeOH)](ClO(4))(2) (R = Me (7); R = Et (8); R = Ph (9)). Complexes 4-6 were obtained in yields of 20%, 44%, and 37%, respectively. They are mixed-valent, with an average Mn oxidation state of +2.5. Complexes 7-9 were obtained in yields of 57%, 65%, and 70%, respectively. They are also mixed-valent, but with an average Mn oxidation state of +2.75. Complexes 4 x 2THF and 9 x 3MeOH x H(2)O crystallize in the triclinic space group P1 macro and contain [Mn(4)(mu(3)-O)(2)](6+) and [Mn(4)(mu(3)-O)(2)(mu-OMe)(2)](5+) cores, respectively, the latter being a new structural type in the family of Mn(4) complexes. Reactivity studies of 4-9 have shown that 4-6 can be converted into 7-9, respectively, and vice versa. The magnetic properties of 5 and 9 have been studied by dc and ac magnetic susceptibility techniques. Complex 5 displays antiferromagnetic coupling between its Mn ions resulting in a spin ground state of S = 0. Complex 9 also displays antiferromagnetic coupling, but the resulting ground state is S = (7)/(2), as confirmed by fitting magnetization versus field data collected for 9 at low temperatures, which gave S = (7)/(2), D = -0.77 cm(-1), and g = 1.79. Complex 9 exhibits a frequency-dependent out-of-phase ac susceptibility peak, indicative of the slow magnetization relaxation that is diagnostic of single-molecule magnetism behavior.

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“…The 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen) have been extensively used as chelating ligands in both analytical and preparative coordination chemistry for a long time 18 . Over the last decades, systematic studies of other -diimine derivatives such as dipyrido [3,2-d:20,30-f]quinoxaline (dpq) and dipyrido [3,2-a:20,30-c]phenazine (dppz) have been undertaken [19][20][21][22][23][24][25][26][27] . A key feature of these six-membered fused N-heterocyclic rings is their π-electron deficiency, which make them excellent π-acceptor ligands and suitable as intercalated agents and photophysical probes in DNA binding and cleavage properties.…”

Section: Introductionmentioning

confidence: 99%

Four related mixed-ligand nickel(ii) complexes: effect of steric encumbrance on the structure, DNA/BSA binding, DNA cleavage and cytotoxicity

Gao

Zhang

et al. 2015

RSC Adv.

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Four closely related mononuclear nickel(II) complexes [Ni(L)(diimine)Cl](ClO 4 ) (1-4), where L is a tridentate polypyridyl ligand of 4-methyl-N,N-bis(pyridin-2-ylmethyl)aniline and diimine is 2,2′-bipyridine (bpy, 1), 1,10-phenanthroline (phen, 2), dipyrido [3,2-d:20,30-f]quinoxaline (dpq, 3) or dipyrido[3,2-a:20,30-c]phenazine (dppz, 4), have been synthesized and characterized by using various physico-chemical techniques. All Ni centers adopt distorted octahedral geometry with N 5 Cl donor sets. From 1 to 4, the dihedral angles between benzene ring of L and the plane of the diimine exhibit gradually decline (52.5-6.8°), leading to the increasing steric encumbrance. The interactions of the complexes with CT-DNA and BSA have been explored by using absorption and emission spectral methods. These complexes display binding propensity to the CT-DNA giving a relative order: 4 (dppz) > 3 (dpq) > 2 (phen) > 1 (bpy), and the quenching mechanisms of BSA by all complexes are static procedures. In the absence of any external agents, only 1 (bpy) and 4 (dppz) exhibit apparent DNA cleavage activity, while with the addition of GSH or on the irradiation with UV-A light of 365 nm, the DNA cleavage abilities of the complexes are obviously enhanced, which vary as 1> 2 > 3 > 4 (GSH) and 4 > 3 > 2 > 1 (UV-A). In addition, the vitro  Corresponding authors. cytotoxicity of the complexes on tumor cells lines (MCF-7, HepG-2 and SGC-7901) have been examined by MTT and the morphological assessment obtained by using Hoechst 33342 staining reveals that 4 against HepG-2 induces apoptosis.

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A novel copper(II) complex containing the ligand 1,2-bis(2,2'-bipyridyl-6-yl)ethane: structural, magnetic, redox, and spectral properties

Cited by 55 publications

References 3 publications

Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Tetranuclear Manganese Complexes with Dimer-of-Dimer and Ladder Structures from the Use of a Bis-Bipyridyl Ligand

Four related mixed-ligand nickel(ii) complexes: effect of steric encumbrance on the structure, DNA/BSA binding, DNA cleavage and cytotoxicity

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