Two monomeric zinc(II) complexes of betaine
(Me3N+CH2CO2¯
= bet),
[Zn(bet)2(H2O)Cl]
(ClO4) (1) and
[Zn(bet)3(H2O)]
(ClO4)2 (2), have been prepared
and characterized by single-crystal structural analysis. The zinc atom in both
complexes is coordinated in a distorted tetrahedral geometry: the zinc atom in
complex (1) is surrounded by one aqua ligand (Zn–O 1·979(3)
Å), one chloro ligand (Zn–Cl 2·218(1) Å ) and two
monodentate carboxylate groups (Zn–O 1·946(2) Å); the zinc
atom in complex (2) is ligated by one aqua ligand (Zn–O 1·997(6)
Å) and three monodentate carboxylategroups (Zn–O
1·943(5)–2·106(8) Å). In both complexes, the aqua
ligand forms strong donor hydrogenbonds with adjacent carboxylate oxygens (for
complex (1), O · · · O is 2·689(2) Å; for
complex (2), O · · · O are 2·67(1) and
2·709(8) Å); these interactions are discussed in the context of
zinc complexesand enzyme active sites.
Single crystal structural analysis of YBCO-123 superconductor by using high power X-ray single crystal diffractometer
