The metalloenzyme nitrogenase is utilized by microbial diazotrophs to accomplish the majority of biological nitrogen fixation. Many different forms of the enzyme nitrogenase are known to exist. They are categorized by the type of metal cluster providing the N2-binding site, which is also the active site of the enzyme. The nitrogenase best-characterized to date has an active site with the compos...

Phase transformations in the supercooled liquid region (between T, and T,,,), prior to the onset of crystallization, in amorphous Pd-Ni-P alloys remain controversial. It has been previously proposed that the amorphous alloy decomposes into two amorphous phases prior to the crystallization reaction when annealed in the supercooled liquid region. Investigations by DSC, Mossbauer spectroscopy, X-r...

Eu3InP3 has been prepared as large single crystals with an indium flux reaction. The structure of the new compound is isotypic to Sr3InP3 and crystallizes in the orthorhombic space group Pnma with unit cell dimensions of a = 12.6517(15) A, b = 4.2683(5) A, and c = 13.5643(14) A (Z = 4, T = 140 K, R1 = 0.0404, wR2 = 0.0971 for all data). The structure consists of one-dimensional chains of corner...

(Cyclopentadienone)iron carbonyl complexes have recently received particular attention for their use as catalysts in hydrogenation or transfer reactions including the N-alkylation of amines with alcohols. This is due to easy synthesis from simple and cheap materials, air water stabilities, crucial metal-ligand cooperation giving rise unique catalytic properties. Here, we report a Mossbauer spec...

Recent reports have suggested that the nuclear resonant absorption of a long-lived Mossbauer state e.g., (93m)Nb is mediated by an entangled photon pair (biphoton) rather than by a single photon. Multipolar nuclear excitation in crystals of a single isotope with a natural abundance of 100% spreads in a region containing billions of identical nuclei. As a consequence of the delocalisation, addit...

Mdssbauer parameters are reported for the phosphate minerals triplite, zwieselite, triploidite, and wolfeite. Analysis of the absorption data confirms the existence of non-equivalent ferrous ions. The broadening of the resonance peaks is rationalized on the basis of a microscopic disorder due to half-occupied fluorine sites in the fluoride minerals and to sets of closelv related metal sites in ...