Syntheses, Spectroscopy, and Structural Analyses of Dinuclear Chiral-at-Metal μ-Aqua-tetrakis[(R or S)-N-1-(Ar)ethylsalicylaldiminato]di-Λ- or -Δ-nickel(II) Complexes
Syntheses, Spectroscopy, and Structural Analyses of Dinuclear Chiral-at-Metal μ-Aqua-tetrakis[(R or S)-N-1-(Ar)ethylsalicylaldiminato]di-Λ- or -Δ-nickel(II) Complexes
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双核手性金属 γ-Aqua-tetrakis[(R 或 S)-N-1-(Ar)乙基水杨醛二胺]二-δ- 或 -δ-镍 (II) 配合物的合成、光谱学和结构分析
DOI:
10.1002/ejic.201500128
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发表时间:
2015
影响因子:
2.3
通讯作者:
C. Janiak
中科院分区:
文献类型:
--
作者:
M. Enamullah;M.A. Quddus;M.R. Hasan;G. Pescitelli;R. Berardozzi;G.J. Reiss;C. Janiak
Enantiopure dinuclear μ‐aqua‐tetrakis[(RorS)‐N‐1‐(Ar)ethylsalicylaldiminato]di‐Λ‐ or ‐Δ‐nickel(II) [Ar = C6H5(R‐1/S‐1),p‐MeOC6H4(R‐2/S‐2),p‐ClC6H4(R‐3/S‐3),p‐BrC6H4(R‐4)] complexes have been synthesized from the reaction between (RorS)‐N‐1‐(Ar)ethylsalicylaldimine and nickel(II) acetate. Their CD spectra demonstrate chirality transfer from the ligands to the metal ions and a mirror‐image relationship for the enantiomeric pairR‐3/S‐3in thf. DSC analyses show that the complexes exhibit an irreversible dissociation to the mononuclear species, which in turn undergo decomposition. The1H NMR spectra reveal the presence of four salicylaldiminates, one aqua ligand, and two molecules of methanol in each dinuclear complex. They also confirm the existence of a dinuclear‐bridged aqua bis‐octahedral NiIIcomplex in solution. The IR spectra in CH2Cl2show a very strong band at around 2306 cm–1due to the νO–H of the bridged aqua ligand. The X‐ray structures ofR‐2,S‐2,R‐3, andS‐3confirm the formation of dinuclear compounds comprising two nickel ions, four salicylaldiminates, and one aqua ligand with two molecules of methanol (or water inS‐2). Each nickel ion is surrounded by twoN,O‐chelating salicylaldiminates, a bridging salicyl‐O atom from the neighboring nickel ion, and a bridging aqua ligand in a distorted octahedral polyhedron. Analyses of the absolute structures reveal a diastereomeric induction of theRorSligand giving a Λ or Δ configuration at the nickel atoms inR‐2/3orS‐2/3that is independent of the ligand substituents.
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DOI:
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发表时间:
1991
期刊:
影响因子:
--
作者:
P. Steel
通讯作者:
P. Steel
DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
M. Enamullah;F. Renz;U. el;G. Wiesinger;W. Linert
通讯作者:
W. Linert
DOI:
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发表时间:
1995
期刊:
影响因子:
--
作者:
M. Enamullah;W. Linert
通讯作者:
W. Linert
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
W. Linert;M. Enamullah;V. Gutmann;R. Jameson
通讯作者:
R. Jameson
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
K. Wärnmark;Jim A. Thomas;O. Heyke;J. Lehn
通讯作者:
J. Lehn