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Synthesis, characterization and magnetostructural correlation studies on three binuclear copper complexes of pyrimidine derived Schiff base ligands

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Title: Synthesis, characterization and magnetostructural correlation studies on three binuclear copper complexes of pyrimidine derived Schiff base ligands
Authors: Gupta, Samik1, Pal, Sachindranath2, Barik, Anil Kumar3, Hazra, Arijit1, Roy, Somnath1, Mandal, Tarak Nath1, Peng, Shie-Ming4, Lee, Gene-Hsiang4, Salah El Fallah, M.5 salah.elfallah@qi.ub.es, Tercero, Javier5, Kar, Susanta Kumar1 skkar_cu@yahoo.co.in
Source: Polyhedron. Aug2008, Vol. 27 Issue 12, p2519-2528. 10p.
Subjects: Schiff bases, Ligands (Chemistry), Magnetic structure, Mathematical complexes
Abstract: Abstract: Three binuclear Cu(II) complexes of two pyrimidine derived Schiff base ligands, 2-S-methyl-6-methyl-4-formyl pyrimidine-N(4)-ethyl thiosemicarbazone (HL1) and salicyl hydrazone of 2-hydrazino-4,6-dimethylpyrimidine (HL2), have been prepared. HL1 produces a bis(μ-thiolato) Cu(II) complex co-crystallizing with its mononuclear analog, [Cu2(L1)2(NO3)2][Cu(L1)(NO3)] (1). On the other hand HL2 shows versatility by producing two different classes of binuclear Cu(II) complexes, a bis(μ-phenoxo) complex [Cu2(L2)2(NO3)2] (2) and another a (μ-4,4′-bipyridyl) complex, [Cu2(L2)2(μ-4,4′-bipyridyl)(NO3)2] (3) under suitable conditions. All the three complexes show distorted square pyramidal geometry around each Cu atom but to a varied extent. Magnetic behavior of complex 1 shows that it is strongly ferromagnetic in nature whereas compounds 2 and 3 are weakly antiferromagnetic in nature. A magnetostructural correlation study combined with molecular modelling on complexes 1 and 2 has thrown light on the difference on magnetic interaction between the Cu atoms in these two complexes. Various factors that may be responsible for such differences are also explored. A novel and potentially useful pH dependant conversion of 3 to 2 has also been noticed. [Copyright &y& Elsevier]
Copyright of Polyhedron is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Synthesis, characterization and magnetostructural correlation studies on three binuclear copper complexes of pyrimidine derived Schiff base ligands
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  Data: <searchLink fieldCode="AR" term="%22Gupta%2C+Samik%22">Gupta, Samik</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pal%2C+Sachindranath%22">Pal, Sachindranath</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Barik%2C+Anil+Kumar%22">Barik, Anil Kumar</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Hazra%2C+Arijit%22">Hazra, Arijit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Roy%2C+Somnath%22">Roy, Somnath</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mandal%2C+Tarak+Nath%22">Mandal, Tarak Nath</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Peng%2C+Shie-Ming%22">Peng, Shie-Ming</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Lee%2C+Gene-Hsiang%22">Lee, Gene-Hsiang</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Salah+El+Fallah%2C+M%2E%22">Salah El Fallah, M.</searchLink><relatesTo>5</relatesTo><i> salah.elfallah@qi.ub.es</i><br /><searchLink fieldCode="AR" term="%22Tercero%2C+Javier%22">Tercero, Javier</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Kar%2C+Susanta+Kumar%22">Kar, Susanta Kumar</searchLink><relatesTo>1</relatesTo><i> skkar_cu@yahoo.co.in</i>
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  Data: <searchLink fieldCode="JN" term="%22Polyhedron%22">Polyhedron</searchLink>. Aug2008, Vol. 27 Issue 12, p2519-2528. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Schiff+bases%22">Schiff bases</searchLink><br /><searchLink fieldCode="DE" term="%22Ligands+%28Chemistry%29%22">Ligands (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+structure%22">Magnetic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+complexes%22">Mathematical complexes</searchLink>
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  Data: Abstract: Three binuclear Cu(II) complexes of two pyrimidine derived Schiff base ligands, 2-S-methyl-6-methyl-4-formyl pyrimidine-N(4)-ethyl thiosemicarbazone (HL1) and salicyl hydrazone of 2-hydrazino-4,6-dimethylpyrimidine (HL2), have been prepared. HL1 produces a bis(μ-thiolato) Cu(II) complex co-crystallizing with its mononuclear analog, [Cu2(L1)2(NO3)2][Cu(L1)(NO3)] (1). On the other hand HL2 shows versatility by producing two different classes of binuclear Cu(II) complexes, a bis(μ-phenoxo) complex [Cu2(L2)2(NO3)2] (2) and another a (μ-4,4′-bipyridyl) complex, [Cu2(L2)2(μ-4,4′-bipyridyl)(NO3)2] (3) under suitable conditions. All the three complexes show distorted square pyramidal geometry around each Cu atom but to a varied extent. Magnetic behavior of complex 1 shows that it is strongly ferromagnetic in nature whereas compounds 2 and 3 are weakly antiferromagnetic in nature. A magnetostructural correlation study combined with molecular modelling on complexes 1 and 2 has thrown light on the difference on magnetic interaction between the Cu atoms in these two complexes. Various factors that may be responsible for such differences are also explored. A novel and potentially useful pH dependant conversion of 3 to 2 has also been noticed. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polyhedron is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.poly.2008.05.009
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        Text: English
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        StartPage: 2519
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        Type: general
      – SubjectFull: Ligands (Chemistry)
        Type: general
      – SubjectFull: Magnetic structure
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      – SubjectFull: Mathematical complexes
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      – TitleFull: Synthesis, characterization and magnetostructural correlation studies on three binuclear copper complexes of pyrimidine derived Schiff base ligands
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              Text: Aug2008
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