Studies of β-Diketone Complexes of Rhenium. Part II. Physical Studies of Dihalobis(pentane-2,4-dionato)rhenium(IV) Compounds

Abstract

Studies on trans-Re(acac),CI, in the solid state, solution, and gas phases by spectroscopic and classical physical methods show that the compound is a monomer and not a dimer as previously claimed (2). cisRe(acac),CI,, Re(acac),Br,, Re(acac),I,, and Re(dbm),CI, have been prepared for the first time and corresponding physical measurements are reported.Les etudes effectukes sur le (runs-Re(acac),CI,, en phase solide, en solution et en phase gazeuse au moyen des methodes spectroscopiques et physiques classiques, montrent que ce compost est un monomere et non un dimere comme cela avait CtC annonce (2). Les composes nouveaux, cis-Re(acac),CI,, Re(acac),Br,, Re-(acac),I,, et Re(dbm),CI,, ont kt6 prepares et les mesures physiques correspondantes sont rapportees.

The physico-chemical properties of 4-chlorophenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II)

“…The valency ν(C-Cl) vibration bands occur at 740-720cm -1 and those of the asymmetric and symmetric ν(C-O-C) at 1260-1217cm -1 and 1060-1058cm -1 , respectively. The bands at 458-330cm -1 confirm the ionic metaloxygen bond [27][28][29][30][31][32][33][34][35][36]. In the range of 458-439cm -1 they increase in the following way: Mn(II) < Co(II) < Ni(II) < Cu(II), which suggests the stronger M-O bond in the case of Cu(II) complex.…”

Magnetic, thermal and spectroscopic properties of 5-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)

“…The valency n (C-Cl) vibration bands occur at 710-700 cm -1 and the bands at 648-644 cm -1 confirm the n (C-OCH 3 ) and ring vibrations. [10][11][12][13][14][15][16][17][18][19][20][21] The bands at 473-434 cm -1 result from n (M-O), n (C-OCH 3 ) and r (COO -) vibrations. The oscillation ring vibrations result in the bands at 387-378 cm -1 .…”

Dielectric behavior and molecular structure of inorganic complexes

“…Complexes Re(acac)2CI2, Re(acac)2Br2, and Re(acac)2I2 are monomer and can exist in cis and trans configurations, which can be synthesized by means of different methods. 58 Tropolonate derivatives of these compounds and of tin, titanium, and zirconium have structures very similar to those of the corresponding acetylacetonate ones. 57,59 No significant difference exists between the chelates of /3diketones and those of mercapto-/3-diketones.…”