PURPOSE The purpose of this study was to evaluate the bond strength of composite resin on the fracture surface of metal-ceramic depending on the repair systems and surface roughening methods. MATERIALS AND METHODS A total of 30 disk specimens were fabricated, 15 of each were made from feldspathic porcelain and nickel-chromium base metal alloy. Each substrate was divided into three groups acco...

Flexible anionic metal-organic frameworks (MOFs) are transformed into neutral heterobimetallic systems via single-crystal-to-single-crystal processes invoked by cation insertion. These transformations are directed by cooperative bond breakage and formation, resulting in expansion or contraction of the 3D framework by up to 33% due to the flexible nature of the organic linker. These MOFs display...

Disintegrating the adhesive bridge from the abutment is one of the most uncomfortable consequences for the patient, and especially for the therapeutist, as it arises a question on the justifiability of the applied method. The success of these appliances depends on the design of the metal skelet, the strenght of the cement itself, as well as its bonding with the etched enamel and the dental allo...

Concerted research is being carried out to synthèses various types of metal acetylides. Acetylides give excellent reaction versatility towards metal counterpart. Flexibility in the molecular conformation also increases. In this project two metal acetylides of iron and tungsten have been prepared. [LM(CO)nC≡CR] [{L= 5 -C5H5, M = W, R = ( 5 -C5H4)Fe( 5 C5H5), n = 3},{L= 5 -C5Me5, M = Fe, R = Ph, ...

ganic chemistry. In particular, they play an important role in carbon–carbon bond formation. A metalacycle, i.e., a ring compound containing a transition metal, is a useful intermediate in synthetic organic chemistry. Oxidative cyclization of unsaturated hydrocarbons, such as alkene, alkyne, carbonyl compounds, or nitrile, using a low-valent transition metal is a useful reaction for synthesis o...

INTRODUCTION Complexes containing metal-boron bonds are relatively new to organometallic chemistry. Just over 20 years ago, the first crystallographically characterized complexes containing a transition metal-boron bond were reported. Boron is typically encountered in the +3 oxidation state, and boron species commonly serve as Lewis acids via their vacant p-orbital. Indeed, metal borane complex...

A number of assignments have been previously posited for the metal-nitrogen stretch (nu(M-NR)), the N-R stretch (nu(MN-R)), and possible ligand deformation modes associated with terminally bound imides. Here we examine mononuclear iron(III) and cobalt(III) imido complexes of the monoanionic tridentate ligand [PhBP3] ([PhBP3] = [PhB(CH2PPh2)3]-) to clarify the vibrational features for these triv...

The electronic and redox properties of a series of cyclometalated Pd complexes with oxidation states of +2, +3 and +4 were examined using a range of currently available spectroscopic and electrochemical techniques. Changes in metal-ligand bond lengths were established by X-ray crystallography and correctly predicted by DFT calculations, from which the frontier orbitals and partial atomic charge...