The three-dimensional molecular and crystal structures of a pair of enantiopure mirror complexes of Ni (II) to chiral Schiff bases of (R)- and (S)-serine with (S)- and (R)-2-N-(N′-benzylprolyl)-aminobenzophenone (BPB), denoted as (S,R)-BPB-Ser-Ni and (R,S)-BPB-Ser-Ni, respectively, have been determined by X-ray diffraction. The complexes crystallize in the orthorhombic space group P2 1 2 1 2 1 with unit cell parameters: a = 10.050(2) Å, b = 10.100(2) Å, c = 26.514(5) Å, V = 2691.3(9) Å3, and Z = 4 for (S,R)-BPB-Ser-Ni; and a = 9.878(2) Å, b = 10.130(2) Å, c = 26.304(5) Å, V = 2632.1(9) Å3, and Z = 4 for (R,S)-BPB-Ser-Ni. The Ni atom is square-planar-coordinated to N(1), N(2), O(4), and N(3) of the Schiff base with minor distortion. The hydroxymethyl group on the serine moiety is axial to the coordination plane and parallel to the neighboring phenyl group.
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We thank the Hi-Tech R & D Program of China (Grant No.2003AA235051) and the Major Basic R & D Program of China (Grant No.2003CB716001) for financial support. The corresponding author Z. Li thanks Prof. Yuri N. Belokon with A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences for kindly help.
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Qin, W., Cao, F., Li, Z. et al. Synthesis and crystal structures of complexes of Ni (II) to chiral Schiff bases of (R)- and (S)-serine with (S)- and (R)-2-N-(N′-benzylprolyl)-aminobenzophenone. J Chem Crystallogr 36, 61–65 (2006). https://doi.org/10.1007/s10870-005-9025-9
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DOI: https://doi.org/10.1007/s10870-005-9025-9