Search results for "Electronic spin"

Unprecedented multiple electronic spin transition in hepta- and nonanuclear complex compounds observed by Mössbauer spectroscopy

2005

Abstract The precursor [Fe(III)(5L)Cl](5LH2 = N,N′-bis(1-hydroxy-2- benzyliden)-1,7-diamino-4-azaheptane) is a high-spin (S = 5/2) complex. This precursor combined with the bridging units [Fe(II)(CN)6]4−, [Co(III)(CN)6]3−, and [Mo(CN)8]4− yields starshaped hepta- and nonanuclear clusters, [Fe(II){(CN)Fe(III)(5L)}6]Cl2, [Co(III){(CN)Fe(III)(5L)}6]Cl3 and [Mo(IV){(CN)Fe(III)(5L)}8]Cl4. The starshaped compounds are high-spin systems at room temperature. On cooling to 20 K some of the iron(III) centers in the Co(III)- and Mo(IV)-star switch to the low-spin state as proven by Mossbauer spectroscopy, i.e., multiple electronic transitions, while the Fe(II)-star remains in the high-spin state.

Molecular Sensors for Moisture Detection by Mössbauer Spectroscopy

2002

A parameter of importance in various industrial and commercial applications is sensitivity to moisture. A new class of molecular sensors which enable the qualitative and quantitative determination of air moisture (high selectivity and sensitivity) by application of Mossbauer spectroscopy as the probe technique has been investigated. The electronic properties of the iron-containing sensor depend upon the presence of moisture which is taken up by it and this process is accompanied by a change in electronic spin ground state which can be detected by Mossbauer spectroscopy. The sensor is suitable for in-field and industrial application using the recently developed Mossbauer spectrometer MIMOS I…

Electronic Spin Crossover

2003

Unusual packing of ET molecules caused by π–π stacking interactions with TRISPHAT molecules in two [ET][TRISPHAT] salts (ET=bis(ethylenedithio)tetrat…

2007

Abstract The synthesis, structure and physical properties of two new radical salts formed with the organic donor bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) and a racemic mixture of the chiral anion (tris(tetrachlorobenzenediolato)phosphate(V)) (TRISPHAT) are reported. The structure of the salts (ET)4[TRISPHAT]4 · 3.5H2O (1) and (ET)(TRISPHAT) · CH2Cl2 · CH3CN (2) has been solved by X-ray single crystal diffraction. Unusual packings of ET molecules are obtained in the two structures. The electrical properties indicate that both compounds are insulators. This is in agreement with the isolation of the ET molecules and their complete ionization. On the other hand, the anisotropy of …