摘要:
The first creatinine ternary complex [Cu(gg)(H2O)(creat)]. 1.5 H2O (1) [gg = glycylglycine (2-), creat = creatinine] has been crystallized from aqueous solution. The coordination geometry about the copper is approximately square pyramidal with the tridentate glycylglycine dianion and the N(1) of creatinine occupying the corners of a square. The coordination sphere about the copper is completed by an axial water molecule, Cu-OW(1) distance 2.496(2) Angstrom. Another water molecule OW(2), Cu-OW(2) distance 2.907(2) Angstrom. extends qualitatively the coordination geometry to octahedral. A third water molecule OW(3) with an occupancy factor of 0.5 is disordered and is located between two complex units. The complete crystal structure is maintained by an extensive hydrogen-bonding network in which the three types of water molecules are involved.