Optical absorption and Zeeman spectra of Cr³⁺dimers in Cs₃Cr₂Br₉

Magneto-structural correlations and metal-metal bonding in exchange-coupled nonahalodimolybdate (A3Mo2X9; X = chlorine, bromine, iodine) complexes

“…In this respect, and in view of the much larger a overlap in the 2.5-3.2-A region, the M-M ir and <5 overlaps can be neglected. Accordingly, expression 17 reduces to -./ab = a0 + a,5, 2/18 (18) where the term a0 has been added to account for relatively constant superexchange contributions at large M-M distances.…”

“…The results listed in Table IV were fitted by using expression 18 with the formal charge on the Mo varying from zero to 3+ in integral steps. The best fit values of a0 and ax for the chloride and bromide complexes are given in Table V.…”

Coordination chemistry of sterically hindered thiolate ligands. Preparation and structural characterization of the oligomeric homoleptic complexes [o-trimethylsilylbenzenethiolato]copper dodecamer and [o-trimethylsilylbenzenethiolato]silver octamer and a comparison to the structure of the cadmium mononuclear species (Et4N)2[Cd(SC6H4-o-SiMe3)4]

“…Thus, two of the angles at the ring S atoms are expanded from limiting tetrahedral values: the interior Cu-S-Cu angle to 131.3 (12)°a nd the exterior C-S-Cu angle to 119.6 (20)°. To compensate for this angle expansion, the two Cu-S-Cu angles to the diagonal Cu centers bridging the Cu3S3 rings contract to average values of 76.1 (18) and 89.3 (17)°. Consequently, the S-Cu-S angles at Cu (10), Cu(ll), and Cu(12) deviate considerably from the diagonal limit of 180°and may dictate the displacement of these Cu centers toward the interior of the central cylinder.…”

“…-54 (7) 171 (18) "Equivalent isotropic U defined as onethogonalized Uv tensor. structure determinations are given in Table I.…”

Exchange Pathways in Tris-μ-thiolato-Bridged [Cr2L3](ClO4)2Cl·H2O·MeOH (L = 2,6-Bis(aminomethyl)-4-tert-butyl-thiophenolate)

“…A wide range of compounds containing exchange-coupled Cr 3+ dimers have been investigated within the past decades, among which triply bridged dimers built of two face-sharing octahedra have attracted special interest due to their high trigonal symmetry. A number of tri-μ-hydroxo-bridged − as well as fluoro-, chloro-, − and bromo-bridged − Cr 3+ dimers have been reported in the literature. The halo-bridged ones belong to the well-known family of A 3 Cr 2 X 9 (A = Cs + , Rb + , K + , Et 4 N + ) compounds.…”