start-ver=1.4
cd-journal=joma
no-vol=171
cd-vols=
no-issue=
article-no=
start-page=515
end-page=522
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190812
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Homodinuclear lanthanoid(III) dithiocarbamato complexes bridged by 2,2′-bipyrimidine: Syntheses, structures and spectroscopic properties
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Four new homodinuclear lanthanoid(III) dithiocarbamato (RR'dtc(-)) complexes bridged by 2,2'-bipyrimidine (bpm) of the form [{Ln(RR'dtc)(3)}(2)(mu-bpm)] {Ln = Nd or Eu; RR' = dimethyl- (Me-2) or pyrrolidine(pyr)} were prepared and their crystal structures and spectroscopic properties were characterized. The crystallographic studies revealed that all of the complexes possess a similar structural motif with an 8:8-coordination geometry, in which the bpm ligand bridges two Ln(III) centers in the kappa N-2(1,1') : kappa N-2(3,3') mode and three RR'dtc(-) ligands coordinate to each Ln(III) center. The complexes exhibit weak but relatively sharp f-f transition bands in the absorption and magnetic circular dichroism (MCD) spectra recorded in the visible region. The MCD spectral studies demonstrated the magneto-optical behavior of the complexes. The spectral features of the dithiocarbamato complexes were distinctly different from those of their beta-diketonato analogues, suggesting the coordination environment around the Ln(III) center influences the electronic structure and spectroscopic symmetry of the complexes in solution. 
en-copyright=
kn-copyright=

en-aut-name=YakubuAbdallah
en-aut-sei=Yakubu
en-aut-mei=Abdallah
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SuzukiTakayoshi
en-aut-sei=Suzuki
en-aut-mei=Takayoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KitaMasakazu
en-aut-sei=Kita
en-aut-mei=Masakazu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Education, Okayama University
kn-affil=
en-keyword=2,2 '-Bipyrimidine
kn-keyword=2,2 '-Bipyrimidine
en-keyword=Dithiocarbamate
kn-keyword=Dithiocarbamate
en-keyword=Homodinuclear
kn-keyword=Homodinuclear
en-keyword=Electronic structure
kn-keyword=Electronic structure
en-keyword=Magnetic circular dichroism
kn-keyword=Magnetic circular dichroism
END

start-ver=1.4
cd-journal=joma
no-vol=498
cd-vols=
no-issue=
article-no=
start-page=119124
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20191201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Dinuclear lanthanoid(III) dithiocarbamato complexes bridged by (E)-N-benzylidenepicolinohydrazonate: Syntheses, crystal structures and spectroscopic properties
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= (E)-N-Benzylidenepicolinohydrazide (Hbphz) was used to synthesize a series of hydrazonato-bridged homodinuclear Ln(2)(III) dithiocarbamato (RR'dtc(-)) complexes of the form [{Ln(RR' dtc)(2)}(2)(mu-bphz)(2)] {Ln= La, Pr, Nd, Sm or Eu; RR'= dimethyl-(Me-2) or pyrrolidine-(pyr)}. X-ray crystallographic studies revealed that these complexes possessed a common head-to-tail type dinuclear structural motif in which two hydrazonato ligands bridged two Ln(III) centers in the mu- 1 kappa N-2(py),O:2 kappa O-2,N(imine) mode and two RR'dtc ligands coordinated to each Ln(III) center. Interestingly, while the Sm-III and Eu-III complexes crystallized as simple 8:8-coordinate dinuclear molecules, the lighter Ln(III) (i.e. La-III, Pr-III and Nd-III) complexes afforded in some cases 9:9-coordinate molecules, where the ninth coordination site was occupied by a solvent ethanol or methanol molecule. Even for the lighter Ln(III) complexes, the complexes were solved in dichloromethane or chloroform as the 8:8-coordinate dimer, as revealed by H-1 NMR spectroscopy. In the UV-visible absorption and magnetic circular dichroism (MCD) spectra of the complexes, similar spectral patterns for ligand-centered and Laporte forbidden f-f transitions were observed. The MCD spectral studies demonstrated the characteristic magneto-optical behavior of the complexes.
en-copyright=
kn-copyright=

en-aut-name=YakubuAbdallah
en-aut-sei=Yakubu
en-aut-mei=Abdallah
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SuzukiTakayoshi
en-aut-sei=Suzuki
en-aut-mei=Takayoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KitaMasakazu
en-aut-sei=Kita
en-aut-mei=Masakazu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Education, Okayama University
kn-affil=
en-keyword=Hydrazone
kn-keyword=Hydrazone
en-keyword=Dithiocarbamate
kn-keyword=Dithiocarbamate
en-keyword=Crystal structures
kn-keyword=Crystal structures
en-keyword=Lanthanoid
kn-keyword=Lanthanoid
en-keyword=Magnetic circular dichroism
kn-keyword=Magnetic circular dichroism
END