Square-planar complexes with the formula [Pt(L
2)(L
1)](X)
2·nH
2O, where L
1 is
S-2-aminomethylpyrrolidine (
S-pyrda) or 2-aminomethylpiperidine (pipda) and L
2 is diammine (X
=Cl), cyclobutane-1,1-dicarboxylato (cbdca) (X=none), 2,2′-bipyridine (bpy) (X=NO
3), or 1,10-phenanthroline (phen) (X=Cl), were prepared and the nature of the coordination of L
1 was examined by
1H-NMR spectroscopy and X-ray crystallography. These 2-aminomethylazacycloalkane derivatives form five-membered chelate rings condensed with an azacycloalkane ring in
cis- or
trans-configurations. The
1H-NMR spectrum of complexes with
S-pyrda as L
1 were consistent with
cis-condensed rings in an
S(
N) conformation with any of L
2 group. However,
1H-NMR spectra of the complexes with pipda as L
1 indicated
trans-fused successive rings for the diammine and cbdca as L
2, but spectra for bpy and phen as L
2 were consistent with a conformation having
cis-fused successive rings. X-Ray crystallography data for the two complexes with pipda as L
1 and cbdca (1) and bpy (2) as L
2 confirms the different coordination behavior in the solid state.
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