Synthesis, Structural Characterization, and Magnetic Properties of the Heteroleptic Dinuclear Nickel Selenite Complex [{Ni(TMEDA)SeO₃}₂]

Abstract

The reaction of Ni(NO 3 ) 2 ·6H 2 O with Na 2 SeO 3 in the presence of tetramethylethylenediamine (TMEDA) in a water/ ethanol mixture yielded the heteroleptic complex [{Ni(TMEDA)SeO 3 } 2 ] (1). Single-crystal X-ray diffraction analysis showed that complex 1 consists of a dinuclear species in which the two nickel atoms are held together by two bridging selenito anions. The crystal packing of 1 is determined by networks of hydrogen bonds, involving cocrystal-

Bis(triphenylphosphanylidene)iminium dichloridotriphenylstannate(IV)

“…The title compound was isolated from a dichloromethane solution as a by product of the reaction between of Ph 3 SnCl with [Ph 3 P=N=PPh 3 ] + HSeO 3in dichloromethane solvent. The hydrogen selenite salt, prepared in the framework of our research activity on selenite compounds (Delferro et al, 2010, Delferro et al, 2011, contained a significant amount of [Ph 3 P=N=PPh 3 ] + Cl -, which is responsible of the formation of the title compound.…”

“…Hydrogen-bond geometry (Å , ). Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).…”

Mild Synthesis and Structural Characterization of a Novel Vanadyl Selenite-Hydrogen Selenite Phase, Na[VO(SeO3)(HSeO3)]·1,5H2O

“…The bridging properties of selenites for connecting to transition metal cations allow magnetic exchange between paramagnetic centers in oligonuclear transition metal selenite complexes [1]. Recently, the weakly coordinative capability of the Se(IV) electron lone pair has been found to give rise to supramolecular interactions, as observed for the polyoxoselenitepalladate anions [Pd 15 (µ 3 -SeO 3 ) 10 (µ 3 -O) 10 Na] 9− in the solid state [2].…”