scholarly journals Outstanding Enhancement in the Axial Coordination Ability of the Highly Rigid Cofacial Cyclic Metalloporphyrin Dimer

2021 ◽  
Author(s):  
Ken-ichi Yamashita ◽  
Kazuhiro Furutani ◽  
Takuji Ogawa
Keyword(s):  
Metal Ions ◽  
Cooperative Effect ◽  
Bidentate Ligand ◽  
Axial Coordination ◽  
Axial Ligation ◽  
High Rigidity ◽  
Guest Binding ◽  
Nickel Porphyrin ◽  
Coordination Ability ◽  
Porphyrin Dimer

<div>Copper- and nickel-porphyrin complexes show extremely weak axial coordination ability without any electron-withdrawing groups. Herein, we report axial ligation on Cu<sup>II</sup>- and Ni<sup>II</sup>-porphyrins in a highly rigid cofacial porphyrin dimer with a bidentate ligand, 1,4-diazabicyclo[2.2.2]octane (DABCO). To the best of our knowledge, this is the first report on the use of Cu<sup>II</sup>- and Ni<sup>II</sup>-porphyrins for coordination-induced guest binding of porphyrin-based host molecules without the help of other metal ions. The high rigidity of the dimer induces guest binding through the cooperative effect of weak axial ligation. The results showed that Cu<sup>II</sup>- and Zn<sup>II</sup>-complexes bind one DABCO molecule inside their cavities, whereas the Ni<sup>II</sup>-complex binds two additional DABCO molecules outside to form a stable 6-coordinate paramagnetic Ni<sup>II</sup>-complexes. <br></div>

scholarly journals Outstanding Enhancement in the Axial Coordination Ability of the Highly Rigid Cofacial Cyclic Metalloporphyrin Dimer

2021 ◽  
Author(s):  
Ken-ichi Yamashita ◽  
Kazuhiro Furutani ◽  
Takuji Ogawa
Keyword(s):  
Metal Ions ◽  
Cooperative Effect ◽  
Bidentate Ligand ◽  
Axial Coordination ◽  
Axial Ligation ◽  
High Rigidity ◽  
Guest Binding ◽  
Nickel Porphyrin ◽  
Coordination Ability ◽  
Porphyrin Dimer

<div>Copper- and nickel-porphyrin complexes show extremely weak axial coordination ability without any electron-withdrawing groups. Herein, we report axial ligation on Cu<sup>II</sup>- and Ni<sup>II</sup>-porphyrins in a highly rigid cofacial porphyrin dimer with a bidentate ligand, 1,4-diazabicyclo[2.2.2]octane (DABCO). To the best of our knowledge, this is the first report on the use of Cu<sup>II</sup>- and Ni<sup>II</sup>-porphyrins for coordination-induced guest binding of porphyrin-based host molecules without the help of other metal ions. The high rigidity of the dimer induces guest binding through the cooperative effect of weak axial ligation. The results showed that Cu<sup>II</sup>- and Zn<sup>II</sup>-complexes bind one DABCO molecule inside their cavities, whereas the Ni<sup>II</sup>-complex binds two additional DABCO molecules outside to form a stable 6-coordinate paramagnetic Ni<sup>II</sup>-complexes. <br></div>

scholarly journals Synthesis, Spectral and Magnetic Studies of Newly Mixed-Ligand Complexes of 4-Formyl-Acetanilide Thiosemicarbazone and 3,4-Dihydrocinnamic Acid with Some Metal Ions

2010 ◽  
Vol 7 (s1) ◽  
pp. S594-S600 ◽  
Author(s):  
Shayma A. Shaker
Keyword(s):  
Metal Ions ◽  
Magnetic Measurements ◽  
Electronic Spectroscopy ◽  
Bidentate Ligand ◽  
Magnetic Studies ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Analysis Determination ◽  
Solid Complexes

New complexes with thiosemicarbazone derivative and 3, 4-dihydrocinnamic acid were prepared and characterized by elemental analysis, determination of metal, IR,1H NMR, electronic spectroscopy and magnetic measurements. The thiosemicarbazone derivative forms bidentate ligand complexes of the general formula, [M(Thz)(Caf)] where Thz = 4-formyl- acetanilide thiosemicarbazone, Caf = 3,4-dihydrocinnamic acid and M=Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+and Pb2+. The IR and1H NMR spectra indicates that the (Thz) was coordinated with the metal ions through the N and S atoms and the (Caf) was negatively charged bidentat ligand and was coordinated with the metal ions through the two O atoms. Electronic spectra and magnetic susceptibility measurements of the solid complexes indicates the tetrahedral geometry around the Mn2+, Fe2+, Co2+, Ni2+, Zn2+, Cd2+and irregular tetrahedral geometry around Pb2+ion while the Cu2+complex has squar planer geometry.

scholarly journals Development of iridium porphyrin arrays by axial coordination through N-bidentate ligand: Synthesis and evaluation of the optical, electrochemical and thermal properties

Polyhedron ◽  
2018 ◽  
Vol 154 ◽  
pp. 302-308 ◽  
Author(s):  
M. Cidália R. Castro ◽  
Arsénio de Sá ◽  
António M. Fonseca ◽  
M. Manuela M. Raposo ◽  
Ana V. Machado
Keyword(s):  
Thermal Properties ◽  
Bidentate Ligand ◽  
Axial Coordination ◽  
Ligand Synthesis

Selective oxidation of thiacalix[4]arenes to the sulfinyl- and sulfonylcalix[4]arenes and their coordination ability to metal ions

1998 ◽  
Vol 39 (41) ◽  
pp. 7559-7562 ◽  
Author(s):  
Nobuhiko Iki ◽  
Hitoshi Kumagai ◽  
Naoya Morohashi ◽  
Kohki Ejima ◽  
Mitsuharu Hasegawa ◽  
...  
Keyword(s):  
Metal Ions ◽  
Selective Oxidation ◽  
Coordination Ability

Retracted Article: One-pot synthesis of O-doped BN nanosheets as a capacitive deionization electrode for efficient removal of heavy metal ions from water

2017 ◽  
Vol 5 (32) ◽  
pp. 17029-17039 ◽  
Author(s):  
Ming Ming Chen ◽  
Da Wei ◽  
Wei Chu ◽  
Tao Wang ◽  
Dong Ge Tong
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Structural Characteristics ◽  
Capacitive Deionization ◽  
Efficient Removal ◽  
One Pot ◽  
One Pot Synthesis ◽  
Retracted Article ◽  
Coordination Ability

BNO nanosheets could capacitively remove multiple metal ions from water due to their unique structural characteristics and coordination ability.

scholarly journals Formation and optical properties of metal/10-hydroxybenzo[h]quinolone complexes in the interlayer spaces of magadiite by solid–solid reactions

2018 ◽  
Vol 5 (5) ◽  
pp. 171732
Author(s):  
Yifu Zhang ◽  
Shengnan Gao ◽  
Hanmei Jiang ◽  
Qiushi Wang ◽  
Yan Cheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Complex Formation ◽  
Metal Ions ◽  
Interlayer Space ◽  
Metal Cations ◽  
Molecular Packing ◽  
Current Work ◽  
Intercalated Compounds ◽  
Coordination Ability

Intercalation and in situ formation of three fluorescent complexes, Al(III)-, Cr(III)- and Cu(II)-10-hydroxybenzo[h]quinolone (M-HBQ, M = Al, Cr and Cu), in the interlayer spaces of magadiite (mag) were studied by solid–solid reactions between metal ions exchanged mags (M-mag, M = Al, Cr and Cu) and HBQ. Results show that the basal spacings of the intercalated composites increase after the intercalation of HBQ into M-mags. The amount of HBQ in the intercalated compounds is different due to the amount of metal ions and the diversification of coordination ability of metal ions, and the order of the coordination ability of these three metal ions is Cu 2+  > Cr 3+  > Al 3+ . The amount of the metal cations in the interlayer of mag is enough for the in situ complex formation of M-HBQ complexes. The slight shift of the absorption and luminescence bands of the complexes suggests the different microstructures, including molecular packing of the complexes in the interlayer spaces of mags, resulting that the host–guest interactions are formed. These findings show that the intercalation and in situ formation of M-HBQ complexes (M = Al, Cr and Cu) in the interlayer space of mag are successfully achieved in the current work.

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