Synthesis and structure of aquamethanol-2′,2‴-(2,6-pyridin-diyldiethylidene)-dioxamohydrazidocobalt(II) perchlorate

Anđelković, Katarina; Ivanović, I.; Prelesnik, Β.; Leovac, Vukadin M.; Poleti, Dejan

doi:10.1016/0277-5387(96)00234-3

Cited by 26 publications

(23 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…30,33 Whenever a different ground state is possible, high spin is always observed. In order to elucidate the factors that govern this structural preference, we performed DFT calculations for all of the above-mentioned isomers (I−XII) of [M(H n dapsox)(H 2 O) 2 ] q to examine their relative stability (see Figure 2), although some of them cannot be experimentally achieved.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…Until now, 3d metal PBPY-7 complexes have been isolated and characterized for the H 2 dapsox ligand with Mn II , 28 Fe II , 29 Co II , 30 and Zn II28 and for Hdapsox and dapsox with Fe III31,32 and Co II . 30,33 Other (and it successor S12g 55 ), and TPSSh. 56 A recent study, 55 however, showed that long-range-corrected hybrid functionals [with 100% (long-range) Hartree−Fock exchange] could also be used reliably for providing the ground state of two related iron(II) complexes (monopyridylmethylamine Fe II (amp) 2 Cl 2 and dipyridylmethylamine [Fe II (dpa) 2 ] 2+ ), given that the former has a high-spin ground state and the latter a low-spin ground state.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of Spin State and Ligand Charge in Coordination Patterns in Complexes of 2,6-Diacetylpyridinebis(semioxamazide) with 3d-Block Metal Ions: A Density Functional Theory Study

Stepanović¹,

Andjelković²,

Zlatar³

et al. 2013

Inorg. Chem.

View full text Add to dashboard Cite

We report here a systematic computational study on the effect of the spin state and ligand charge on coordination preferences for a number of 3d-block metal complexes with the 2,6-diacetylpyridinebis(semioxamazide) ligand and its mono- and dianionic analogues. Our calculations show excellent agreement for the geometries compared with the available X-ray structures and clarify some intriguing experimental observations. The absence of a nickel complex in seven-coordination is confirmed here, which is easily explained by inspection of the molecular orbitals that involve the central metal ion. Moreover, we find here that changes in the spin state lead to completely different coordination modes, in contrast to the usual situation that different spin states mainly result in changes in the metal-ligand bond lengths. Both effects result from different occupations of a combination of π- and σ-antibonding and nonbonding orbitals.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 97%

Section: ■ Introductionmentioning

confidence: 99%

Role of Spin State and Ligand Charge in Coordination Patterns in Complexes of 2,6-Diacetylpyridinebis(semioxamazide) with 3d-Block Metal Ions: A Density Functional Theory Study

Stepanović¹,

Andjelković²,

Zlatar³

et al. 2013

Inorg. Chem.

View full text Add to dashboard Cite

show abstract

“…These hydrazone chelate derivatives act as good potential oral drugs to treat the genetic disorders like thalassemia [4] and are several folds more potent than the metal free chelate, leading to the conclusion that the metal complexes are biologically active species [5]. The structural characterization of these resultant hydrazone complexes revealed some interesting facts, such as their tendency and potency to act as planar pentadentate ligands in most of the complexes [6][7][8][9] along with tridentate character [9][10][11][12][13]. Moreover, these ligands exhibit keto-enol tautomerism (Fig.…”

Section: Introductionmentioning

confidence: 99%

Octahedral Complexes of Cobalt(III) and Nickel(II) Incorporating with Unsymmetrical NNO-Donor Hydrazone Ligand: Synthesis and Structural Aspects

2012

View full text Add to dashboard Cite

Two new octahedral cobalt(III) and nickel(II) complexes, [CoL 2 ]ÁClO 4 (1) and [NiL 2 ]ÁH 2 OÁNO 3 (2) containing the potentially tridentate Schiff base like hydrazone ligand, N 0 -[1-(pyridin-2-yl)ethylidene]acetohydrazide (L) (1:1 condensation product of acetichydrazide and 2-acetylpyridine) were synthesized and characterized by spectral a well as thermal analysis and single crystal X-ray diffractometry. Structural investigation shows that in both complexes, the central Co or Ni atom belongs into N 4 O 2 coordination sphere, developed with the NNO donor sets of two independently hydrazone units. The corresponding M-N(pyridine) bonds being significantly longer than the M-N(imino) bonds, Co1-N1 and Co1-N4 [1.934(3) and 1.926(3) Å ] for 1 and Ni1-N1 and Ni1-N4 [2.076(3) and 2.085(3) Å ] for 2, Co1-N2 and Co1-N5 [1.846(3) and 1.854(3) Å ] for 1 and Ni1-N2 and Ni1-N5 [2.001(3) and 1.972(3) Å ] for 2 respectively.

show abstract

“…These hydrazone chelate derivatives act as good potential oral drugs to treat the genetic disorders like thalassemia [3]. The structural characterization of these resultant hydrazone complexes revealed some interesting facts, such as their tendency and potency to act as planar pentadentate ligands in most of the complexes [4][5][6][7] along with tridentate character [7][8][9][10][11]. Moreover, these ligands exhibit keto-enol tautomerism ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

et al. 2007

View full text Add to dashboard Cite

Three new coordination complexes of Zn(II) and Mn(II) have been synthesised using two different tridentate N,N,O donor hydrazone ligands, Hpbh and Hacpbh respectively. The complexes [Zn(pbh) 2 ] (1) and [Zn (acpbh) 2 ] (2) have been synthesized by the treatment of ZnSO 4 Á 7H 2 O with Hpbh and Hacpbh hydrazone ligands, respectively. The Mn(II) complex [Mn(acpbh) 2 ] (3) was obtained on reacting Mn(NO 3 ) 2 Á 4H 2 O with the ligand Hacpbh.The ligands Hpbh and Hacpbh were prepared by condensing pyridine-2-carboxaldehyde and 2-acetylpyridine with benzhydrazide respectively. Inspite of varying the carbonyl functionality attached to the pyridine moiety present in the hydrazone ligands in both the Schiff bases, we obtained three mononuclear complexes 1, 2, and 3 which were clearly characterized from single crystal X-ray diffraction studies. Spectroscopic investigations like IR and UV/Vis have been carried out for 1, 2, and 3. Fluorescence studies have been performed for 1 and 2. For 3 cyclic voltammetry, room temperature magnetic study and EPR measurements have been recorded.

show abstract

Synthesis and structure of aquamethanol-2′,2‴-(2,6-pyridin-diyldiethylidene)-dioxamohydrazidocobalt(II) perchlorate

Cited by 26 publications

References 16 publications

Role of Spin State and Ligand Charge in Coordination Patterns in Complexes of 2,6-Diacetylpyridinebis(semioxamazide) with 3d-Block Metal Ions: A Density Functional Theory Study

Role of Spin State and Ligand Charge in Coordination Patterns in Complexes of 2,6-Diacetylpyridinebis(semioxamazide) with 3d-Block Metal Ions: A Density Functional Theory Study

Octahedral Complexes of Cobalt(III) and Nickel(II) Incorporating with Unsymmetrical NNO-Donor Hydrazone Ligand: Synthesis and Structural Aspects

Two Zn(II) and one Mn(II) complexes using two different hydrazone ligands: spectroscopic studies and structural aspects

Contact Info

Product

Resources

About