Heptanuclear Complex Research Articles

A heptanuclear Fe(II)–Fe(III) 6 system with twelve unpaired electrons

The pentadentate ligand 5 LH 2 = saldptn = N,N′-bis(1-hydroxy-2-benzyliden)-1,7-diamino-4-azaheptane has been prepared by a Schiff base condensation between 1,7-diamino-4-azaheptane and the corresponding salicyaldehyde. Its complexation with Fe(III) gave the high-spin ( S=5/2) complex of [Fe III ( 5 L)Cl]. This precursor was combined with [Fe(CN) 6] 4− and a blue heptanuclear complex [Fe II{(CN)Fe III ( 5 L)} 6]Cl 2 resulted. This system belongs to the class of high-spin molecules possessing twelve unpaired electrons ( S=6) as proven by the magnetic susceptibility measurements and Mössbauer spectra.

A Mixed-Valence Mixed-Spin Prussian-Blue-Like Heptanuclear Complex

A high-spin ground state S>8 is obtained through ferromagnetic coupling in a FeIIFe complex that models the electronic properties of Prussian blue. The picture shows the postulated core structure for this heptanuclear complex.

Synthesis and Characterization by Electrospray Mass Spectrometry of a Novel Dendritic Heptanuclear Complex of Ruthenium(II)

Synthesis and Characterization by Electrospray Mass Spectrometry of a Novel Dendritic Heptanuclear Complex of Ruthenium(II)

Hexacyanometalates as templates for heteropolynuclear complexes and molecular magnets: synthesis and crystal structure of [Fe{(CN)Cu(tpa)}6][ClO4]8·3H2O, [tpa = tris(2-pyridylmethyl)amine

Reaction of [Fe(CN)6]3– with [Cu(tpa)(OH2)]2+ produces a bimetallic heptanuclear complex, [Fe{(CN)Cu(tpa)}6]-[ClO4]8·3H2O, which is characterised by single-crystal X-ray diffraction and shown to consist of an iron(II) centre connected by cyano bridges to six copper(II) centres forming spherical units of [Fe{(CN)Cu(tpa)}6]8+.

Single‐Step Six‐Electron Transfer in a Heptanuclear Complex: Isolation of Both Redox Forms

Single‐Step Six‐Electron Transfer in a Heptanuclear Complex: Isolation of Both Redox Forms

Preparation, Characterization, and Some Properties of a T-Cage-Type S-Bridged RhIII4ZnII3 Heptanuclear Complex with a Defective [Zn3HO]5+ Core. Crystal Structure of Spontaneously Resolved [{Rh(aet)3}4Zn3HO]Br5 (aet = 2-Aminoethanethiolate)

Abstract The reaction of fac(S)-[Rh(aet)3] with ZnBr2 in water produced a T-cage-type S-bridged polynuclear complex with a “defective” [Zn3HO]5+ core, [{Rh(aet)3}4Zn3HO]Br5 (1Br5), which was subject to spontaneous resolution to give and isomers. 1 was also optically resolved into the two isomers with use of [Sb2(R,R-tartrate)2]2−. The crystal structure and absolute configuration for the spontaneously resolved isomer were determined by X-ray crystallography. [{Rh(C2H6NS)3}4Zn3HO]Br5·9H2O, crystallizes in the cubic space group P213 with a = 19.186 (1) Å, V = 7062.1 (4) Å3, Z = 4, and R = 0.0648. In 1 the four octahedral fac(S)-[Rh(aet)3] subunits are bound to a quasi-tetrahedral [Zn3HO]5+ core in a tetrahedral arrangement. The chiral configurations are regulated to Δ for all fac(S)-[Rh(aet)3] subunits and R for all asymmetric bridging sulfur atoms in -1, giving a quasi-T symmetrical structure. 1 is unstable in water and convertible to a T-cage-type octanuclear complex with a “complete” [Zn4O]6+ core, [{Rh(aet)3}4Zn4O]6+ (2), and to a linear-type S-bridged trinuclear complex, [Co{Rh(aet)3}2]3+, by adding ZnBr2 and [CoCl(NH3)5]Cl2, respectively. The electronic absorption and circular dichroism (CD) spectral behavior of 1 are discussed in comparison with those of 2.