Azaoxa Macrocyclic and Acyclic Complexesof Lanthanides

The template reactions of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8-diamine in the presence of dysprosium(III), thulium(III) and lutetium(III) chlorides and erbium(III) perchlorate produce the complexes of 15-membered macrocyclic ligand with an N3O2 set of donor atoms as a result of the [1+1] Schiff base cyclocondensation. In contrast, analogous reactions involving the lighter lanthanide ions (lanthanum(III), samarium(III) and europium(III)) yield the acyclic complexes with terminal acetylpyridyl groupings as products of the partial [2+1] condensation. The complexes were characterized by spectral data (IR, UV-VIS, 1H NMR, MS), and thermogravimetric and elemental analyses.

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Chelates of nickel(II) and copper(II) with tridentate Schiff base formed by the condensation of S-benzyldithiocarbazate with benzoin

Canadian Journal of Chemistry ◽

10.1139/v78-325 ◽

1978 ◽

Vol 56 (15) ◽

pp. 2000-2002 ◽

Cited By ~ 26

Author(s):

M. T. H. Tarafder ◽

M. Akbar Ali

Keyword(s):

Schiff Base ◽

Spectral Data ◽

General Formula ◽

Schiff Base Ligand ◽

Nickel Complexes ◽

Planar Structure ◽

Spectral Studies ◽

Square Planar ◽

Elemental Analyses ◽

Tridentate Schiff Base

New complexes with the Schiff base ligand derived from S-benzyldithiocarbazate (NH2—NH—CSSCH2C6H5) have been prepared and characterized by elemental analyses, magnetic, conductometric, ir, and electronic spectral studies. The tridentate ONS Schiff base S-benzyl-β-N-(phenyl, phenylhydroxymethyl)methylenedithiocarbazate gave mono-ligand complexes with Ni(II) and Cu(II) having the general formula [MligandX] (M = Ni(II) and Cu(II); X = NO3, Cl, Br, NCS). A proposed square-planar structure for the nickel complexes is supported by magnetic and spectral data. A square-planar structure is also suggested for Cu(II) complexes. The ir results give evidence of the different bondings present in the complexes.

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New phthalocyanines containing bulky electron rich substituents

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424609000838 ◽

2009 ◽

Vol 13 (06) ◽

pp. 753-759 ◽

Cited By ~ 26

Author(s):

İbrahim Özçeşmeci ◽

Orhan Güney ◽

Ali İhsan Okur ◽

Ahmet Gül

Keyword(s):

Energy Transfer ◽

Metal Ions ◽

Spectral Data ◽

Electronic Spectra ◽

Fluorescence Spectra ◽

Radiative Decays ◽

Metal Free ◽

H Nmr ◽

Elemental Analyses ◽

New Compounds

Metal-free and metallophthalocyanines with four 9-anthroyl groups bound through ethylthio ester bridges on the periphery have been prepared. The new compounds were characterized by elemental analyses, 1 H NMR, IR, mass and UV-vis spectral data. The electronic spectra exhibit an intense π-π* transition of 9-anthroyl identity together with characteristic Q and B bands of the phthalocyanine core. Effect of metal ions on intensity of fluorescence spectra of phthalocyanine derivatives substituted with 9-anthroyl groups was investigated. The energy transfer to the phthalocyanine core and radiative decays of the 9-anthroyl emission and phthalocyanine core were examined.

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Synthesis, characterization and crystal structures of the bidentate Schiff baseN,N′-bis(2-nitrocinnamaldehyde)ethylenediamine and its complex with CuNCS and triphenylphosphane

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229615010815 ◽

2015 ◽

Vol 71 (7) ◽

pp. 578-583 ◽

Cited By ~ 3

Author(s):

William Clegg ◽

Ross W. Harrington ◽

Kazem Barati ◽

Mohammad Hossein Habibi ◽

Morteza Montazerozohori ◽

...

Keyword(s):

Schiff Base ◽

Nmr Spectroscopy ◽

Nitro Group ◽

Bidentate Ligand ◽

Molar Ratio ◽

X Ray ◽

X Ray Crystallography ◽

H Nmr ◽

Bite Angle ◽

Elemental Analyses

Reaction of copper(I) thiocyanate and triphenylphosphane with the bidentate Schiff baseN,N′-bis(trans-2-nitrocinnamaldehyde)ethylenediamine {Nca2en, (1); systematic name (1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]}, C20H18N4O4, in a 1:1:1 molar ratio in acetonitrile resulted in the formation of the complex {(1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]-κ2N,N′}(thiocyanato-κN)(triphenylphosphane-κP)copper(I)], [Cu(NCS)(C20H18N4O4)(C18H15P)] or [Cu(NCS)(Nca2en)(PPh3)], (2). The Schiff base and copper(I) complex have been characterized by elemental analyses, IR, electronic and1H NMR spectroscopy, and X-ray crystallography [from synchrotron data for (1)]. The molecule of (1) lies on a crystallographic inversion centre, with atransconformation for the ethylenediamine unit, and displays significant twists from coplanarity of its nitro group, aromatic ring, conjugated chain and especially ethylenediamine segments. It acts as a bidentate ligand coordinatingviathe imine N atoms to the CuIatom in complex (2), in which the ethylenediamine unit necessarily adopts a somewhat flattenedgaucheconformation, resulting in a rather bowed shape overall for the ligand. The NCS−ligand is coordinated through its N atom. The geometry around the CuIatom is distorted tetrahedral, with a small N—Cu—N bite angle of 81.56 (12)° and an enlarged opposite angle of 117.29 (9)° for SCN—Cu—P. Comparisons are made with the analogous Schiff base having no nitro substituents and with metal complexes of both ligands.

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Synthesis and Characterization of Some Novel Schiff Base Complexes of Oxovanadium(IV) Cation

Journal of Chemistry ◽

10.1155/2013/689518 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

A. K. Yadava ◽

H. S. Yadav ◽

Sanjay Singh ◽

U. S. Yadav ◽

D. P. Rao

Keyword(s):

Schiff Base ◽

Spectral Data ◽

Magnetic Moment ◽

Electrical Conductance ◽

Schiff Base Complexes ◽

Synthesis And Characterization ◽

Electronic Spectral Data ◽

Elemental Analyses ◽

Tetraazamacrocyclic Ligands

A series of oxovanadium(IV) complexes of the type [VO(mac)]SO4(where mac = tetraazamacrocyclic ligands derived from condensation of 4,4,4-trifluro-1-(2-furyl)-1,3-butanedione or 4,4,4-trifluro-1-(2-thenyl)-1,3-butanedione withp-phenylenediamine and their reaction withβ-diketones) have been prepared using oxometal ion of vanadium as kinetic template. These complexes have been ascertained by electrical conductance, magnetic moment, elemental analyses, infrared, e.s.r. and electronic spectral data. All the oxovanadium(IV) complexes are five-coordinate ones.

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Structural and Surface Characterization of Newly Synthesized D-π-D Type Schiff Base Ligand: (1E,2E)-3-[4-(Dimethylamino)phenyl]prop-2-en-1-ylidene)phenylamine

Journal of Chemistry ◽

10.1155/2013/298205 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Gulsah Gumrukcu ◽

Serkis Garikyan ◽

Gulnur Keser Karaoglan ◽

Dolunay Sakar

Keyword(s):

Schiff Base ◽

Surface Properties ◽

Schiff Base Ligand ◽

Mass Spectra ◽

Surface Characterization ◽

Acid Base ◽

H Nmr ◽

Elemental Analyses ◽

Uv Visible

A new Schiff base with D-π-D type, (1E,2E)-3-[4-(dimethylamino)phenyl]prop-2-en-1-ylidene)phenylamine, has been successfully synthesized using the reaction of (2E)-3-[4-(dimethylamino)phenyl]acrylaldehyde with aniline. The Schiff base ligand has been characterized by FTIR, UV-visible, and1H NMR as well as TG/DTA, SEM, BET, and elemental analyses and mass spectra. Surface properties and acid-base constants of Schiff base ligand were determined by IGC measurements.

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Syntheses, Spectral Characterization, and Antimicrobial Studies on the Coordination Compounds of Metal Ions with Schiff Base Containing Both Aliphatic and Aromatic Hydrazide Moieties

Bioinorganic Chemistry and Applications ◽

10.1155/2013/981764 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 6

Author(s):

Dinesh Kumar ◽

Silky Chadda ◽

Jyoti Sharma ◽

Parveen Surain

Keyword(s):

Schiff Base ◽

Coordination Compounds ◽

Molar Conductance ◽

Equimolar Ratio ◽

Gram Positive Bacteria ◽

H Nmr ◽

Antimicrobial Studies ◽

Elemental Analyses ◽

Ir Reflectance ◽

Bipyramidal Structure

An EtOH solution of 3-ketobutanehydrazide and salicylhydrazide on refluxing in equimolar ratio forms the corresponding Schiff base, LH3(1). The latter reacts with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Zr(OH)2(IV), MoO2(VI), and UO2(VI) ions in equimolar ratio and forms the corresponding coordination compounds, [M(LH)(MeOH)3] (2, M = Mn, Co, Ni), [Cu(LH)]2(3), [M′(LH)(MeOH)] (4, M′ = Zn, Cd), [Zr(OH)2(LH)(MeOH)2] (5), [MoO2(LH)(MeOH)] (6), and [UO2(LH)(MeOH)] (7). The coordination compounds have been characterized on the basis of elemental analyses, molar conductance, spectral (IR, reflectance,1H NMR, ESR) studies, and magnetic susceptibility measurements. They are nonelectrolytes in DMSO. The coordination compounds, except3, are monomers in diphenyl. They are active against gram-positive bacteria (S. aureus, B. subtilis), gram-negative bacteria (E. coli, P. aeruginosa), and yeast (S. cerevisiae, C. albicans).1acts as a dibasic tridentate ONO donor ligand in2–7coordinating through its both enolic O and azomethine N atoms. The coordination compounds2and3are paramagnetic, while rest of the compounds are diamagnetic. A square-planar structure to3, a tetrahedral structure to4, an octahedral structure to2,6, and7, and a pentagonal bipyramidal structure to5are proposed.

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Synthesis, Spectroscopic and Electrochemical Studies of Mononuclear Fe(II) and Ni(II) Complexes Containing a Macrocyclic Ligand Derived from Pyridine-2,6-dicarboxaldehyde and 1,2-Bis(2-aminoethoxy) Ethane

Journal of Scientific Research ◽

10.3329/jsr.v3i3.7231 ◽

2011 ◽

Vol 3 (3) ◽

pp. 599-607 ◽

Cited By ~ 5

Author(s):

M. M. Alam ◽

R. Begum ◽

S. M. M. Rahman ◽

S. M. S. Islam

Keyword(s):

Schiff Base ◽

Macrocyclic Ligand ◽

Nickel Complexes ◽

Spectroscopic Studies ◽

Octahedral Geometry ◽

Electrochemical Studies ◽

Metal Source ◽

Elemental Analyses ◽

Uv Visible ◽

Metal Perchlorate

The cyclic (2+2) template condensation of 2,6-pyridinedicarboxaldehyde with 1,2-bis(2-aminoethoxy) ethane using Pb(SCN)2 as the metal source gave dinuclear lead(II) complex, Pb2L1(SCN)4 (1), where L1 is tetra-Schiff-base macrocycle. The transmetallation treatment of 1 with suitable metal perchlorate yield [FeL1](ClO4)2 (2) and [NiL1](ClO4)2 (3). The complexes (2 & 3) have been characterized by elemental analyses, IR, UV-visible, and ESI-MS spectroscopy. Based on spectral data, octahedral geometry may be proposed for these complexes. The electrochemical behavior of iron and nickel complexes is reported.Keywords: Macrocyclic complexes; Spectroscopic studies; 1,2-Bis(2-aminoethoxy) ethane; Charge transfer.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: 10.3329/jsr.v3i3.7231 J. Sci. Res. 3 (3), 609-617 (2011)

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Synthesis and Characterization of a Thiocyanate Bridged Dinuclear Cu(II) Complex Containing Macrocyclic Ligand Derived from Pyridine-2, 6-dicarboxaldehyde and 1, 2-bis(2-aminoethoxy) Ethane

Journal of Bangladesh Academy of Sciences ◽

10.3329/jbas.v36i1.10924 ◽

2012 ◽

Vol 36 (1) ◽

pp. 89-96

Author(s):

Md Mahbubul Alam ◽

Faisal Ahmed ◽

Rockshana Begum ◽

Mizanur Rahman ◽

Iqbal Ahmed Siddiquey ◽

...

Keyword(s):

Schiff Base ◽

Spectral Data ◽

Elemental Analysis ◽

Macrocyclic Ligand ◽

Synthesis And Characterization ◽

X Ray ◽

Esi Ms ◽

X Ray Crystallography ◽

Academy Of Sciences

The cyclic (2+2) template condensation of pyridine-2,6-dicarboxaldehyde with 1,2-Bis(2- aminoethoxy) ethane using Pb(SCN)2 gave dinuclear lead (II) complex, Pb2L1(SCN)4 where L1 is a tetra-Schiff-base macrocycle. The transmetallation treatment of Pb2L1(SCN)4 with Cu(ClO4)2.6H2O yield the complex, [Cu2L1(SCN)3(ClO4)] which has been characterized by elemental analysis, IR, ESI-MS spectroscopy and X-ray crystallography. On the basis of spectral data, different geometry of Cu2+ has been suggested. DOI: http://dx.doi.org/10.3329/jbas.v36i1.10924 Journal of Bangladesh Academy of Sciences, Vol. 36, No. 1, 89-96, 2012

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Synthesis and Characterization of β-Diketimine Schiff Base Complexes with Ni(II) and Zn(II) Ions: Experimental and Theoretical Study

Journal of Chemistry ◽

10.1155/2019/4561013 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9

Author(s):

Ibrahim A. M. Saraireh ◽

Mohammednoor Altarawneh ◽

Jibril Alhawarin ◽

Mahmoud Salman ◽

Abdel Aziz Abu-Yamin ◽

...

Keyword(s):

Schiff Base ◽

Schiff Base Complexes ◽

H Nmr ◽

Square Planar ◽

Basic Set ◽

Vis Spectroscopy ◽

Elemental Analyses ◽

Ft Ir ◽

C Nmr

Schiff base diethyl 4,4-(pentane-2,4-diylidenebis(azanylylidene))benzoate (1) as a new ligand (L) was prepared by the reaction of acetylacetone with benzocaine in the ratio of 1 : 1. Two transition-metal complexes, [Ni(II)(LCl(HOEt))] (2) and [Zn(II)(LCl(HOEt))] (3), have been synthesized from metal salts with didentate Schiff base ligand (L) and characterized by elemental analyses, FT-IR, 1H NMR, 13C NMR UV-Vis spectroscopy, and magnetic susceptibility. The biological activity of the complexes was studied. In addition, the M06-2x density function theory method and the 6-31G(d) basic set were applied to determine the optimized structures of 1–3 and to determine their IR and 1H NMR, 13C NMR spectra theoretically. The data are in good agreement with the experimental results. The geometries of complexes 2 and 3 were determined to be square-planar for 2 and tetrahedral for 3.

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