without changing your settings we'll assume you are happy to receive all RSC cookies.
You can change your cookie settings by navigating to our Privacy and Cookies page and following the instructions. These instructions
are also obtainable from the privacy link at the bottom of any RSC page.
Utilizing a SHG inactive ligand, 2-thiobarbituric acid (H3L), three metal complexes formulated as M(H2L)2(H2O)2·2DMF (M = Mg 1 and Ni 2) and Co(H2L)2(H2O)2 (3) were synthesized and structurally characterized by single-crystal X-ray diffractions. Complexes 1 and 2 exhibit a similar uninodal 3D acentric diamondoid framework. Complex 1 displays SHG response using 1064 nm radiation, whereas complex 2 is SHG inactive under the same condition. Complex 3 is also SHG inactive, which exhibits a centro-symmetrical chain-like structure built from Co(II) ions and double strands of H2L−-bridge with the inversion center occupied by the metal(II) ion. In the three complexes, the negative charge of H2L− ligand is delocalized over the OC–CH–CO group and H2L− can be considered as a β-diketo derivative. H2L− shows a bis-monodentate coordination fashion and acts as a u2-bridge in the three complexes, which is different from the classical chelating fashion of β-diketo ligand. In complexes 1 and 2, the two β-diketo oxygen atoms of H2L− are coordinated to two metal centers. Whereas in complex 3, H2L− ligand links two Co(II) centers via one oxygen and one sulphur atoms. The three complexes exhibit different UV-vis absorption, photoluminescence properties and thermal stabilities.
Fetching data from CrossRef. This may take some time to load.