Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazol-2-ylidene Ligands

Three Re(I) tricarbonyl complexes, with the general formulation Re(N^L)(CO)3X (where N^L is a bidentate ligand containing a pyridine functionalized at position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo), were synthesized and their reactivities explored in terms of solvent-dependent ligand substitution, in both the ground and excited states. When they were dissolved in acetonitrile, the complexes bound to the thione ligand underwent reversible ligand exchange with the solvent, resulting in the formation of Re(NCMe)2(CO)3X; the starting complex could be re-formed by precipitation following addition of diethyl ether. On the other hand, the complexes appeared to be inert in dichloromethane or acetone. Conversely, the complex bound to the thiazol-2-ylidene ligand did not display any ligand exchange reaction in the dark but underwent photoactivated ligand substitution on excitation to its lowest metal to ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato complexes as well as free thiazol-2-ylidene ligand

Synthesis and Photochemical Properties of Manganese(I) Tricarbonyl Diimine Complexes Bound to Tetrazolato Ligands

Ten manganese(I) tricarbonyl diimine complexes bound to variably functionalised 5-aryl-tetrazolato ligands were prepared, and their photochemical properties were investigated. Upon exposure to light at 365 nm, each complex decomposed to its free diimine and tetrazolato ligands, simultaneously dissociating three CO ligands, as evidenced by changes in the IR spectra of the irradiated complexes over time. The anti-bacterial properties of one of these complexes were tested against Escherichia coli. While the complex displayed no effect on the bacterial growth in the dark, pre-irradiated solutions inhibited bacterial growth. Comparative studies revealed that the antibacterial properties originate from the presence of free 1,10-phenanthroline

Psychometrics: From practice to theory and back

nonparametric IRT, NIRT, latent unidimensionality, latent multidimensionality, essential unidimensionality, monotone locally independent unidimensional IRT model, MLI1, item pair conditional covariances, DIMTEST, HCA/CCPROX, DETECT, CONCOV, Mokken scaling, generalized compensatory model, approximate simple structure, DIF, differential item functioning, differential bundle functioning DBF, valid subtest, multidimensional model for DIF, MMD, SIBTEST, MultiSIB, Mantel-Haenszel, PolySIB, CrossingSIB, skills diagnosis, formative assessment, Unified Model, reparameterized Bayes Unified Model, MCMC, evidence centered design, ECD, PSAT Score Report Plus,

Testing for local dependency in dichotomous and polytomous item response models

item response theory, item cluster, Mantel-Haenzsel test, multiple inference, NAEP, DIMTEST, Yen'sQ 3 ,

Loss of Information in Estimating Item Parameters in Incomplete Designs

incomplete designs, conditional maximum likelihood, marginal maximum likelihood, F-information, Rasch model, loss of information,

The person response function as a tool in person-fit research

appropriateness measurement, invariant item ordering, nonparametric item response theory, person-fit method, person response function,