96 research outputs found
Orbital Configurations and Magnetic Properties of Double-Layered Antiferromagnet CsCuClBr
We report the single-crystal X-ray analysis and magnetic properties of a new
double-layered perovskite antiferromagnet, CsCuClBr. This
structure is composed of CuClBr double layers with elongated
CuClBr octahedra and is closely related to the SrTiO
structure. An as-grown crystal has a singlet ground state with a large
excitation gap of K, due to the strong
antiferromagnetic interaction between the two layers. CsCuClBr
undergoes a structural phase transition at K accompanied
by changes in the orbital configurations of Cu ions. Once a
CsCuClBr crystal is heated above , its magnetic
susceptibility obeys the Curie-Weiss law with decreasing temperature even below
and does not exhibit anomalies at . This implies that in
the heated crystal, the orbital state of the high-temperature phase remains
unchanged below , and thus, this orbital state is the metastable
state. The structural phase transition at is characterized as an
order-disorder transition of Cu orbitals.Comment: 6pages. 6figures, to appear in J. Phys. Soc. Jpn. Vol.76 No.
Synthesis and Characterization of Ferrocene-Chelating Heteroscorpionate Complexes of Nickel(II) and Zinc(II)
Organonitrile ligated silver complexes with perfluorinated weakly coordinating anions and their catalytic application for coupling reactions
Homogeneous catalytic processes mediated by silver(I) complexes are relatively rare. This work describes the synthesis and characterization of acetonitrile ligated silver salts with three weakly coordinating anions [B(C6F5)(4)](-), [B{C6H3(CF3)(2)}(4)](-) and [(C6F5)(3)B-C3H4N2-B(C6F5)(3)](-). The silver cation is coordinated either by four or by two acetonitrile ligands. All examined Ag(I) complexes show catalytic activity in coupling reactions of terminal alkynes with aldehydes and amines
Asymmetric bipyridine-terpyridine-copper(II) complexes: an approach for new supramolecular architectures
On the way towards novel supramol. assemblies and polymers, several copper(II) complexes consisting of one terpyridine as well as one bipyridine ligand were synthesized in a one-step reaction. The compds. were characterized by UV/VIS spectroscopy and MALDI-TOF mass spectrometry. Single crystals were obtained and their structures were detd. by X-ray analyse
Asymmetric Michael additions via SAMP-/RAMP-hydrazones. Enantioselective synthesis of 2-substituted 4-oxosulfones
Multiple bonds between Main-Group Elements and Transition Metals, 157. Neutral and Cationic ansa- Metallocenes of Niobium(V) and Tantalum(V): Synthesis, Structures and Stereochemical Non-Rigidity
Catalytic desulfurization reactions using triple bond dimolybdenum and ditungsten organo- metallic complexes
Novel Naphthalene– and Cyclohexa-1,3-diene–Silene Cycloadducts
Auner N, Seidenschwarz C, Herdtweck E, Sewald N. Novel Naphthalene– and Cyclohexa-1,3-diene–Silene Cycloadducts. Angewandte Chemie International Edition. 1991;30(4):444-446
- …