Dinuclear diselenolenes derived from cycloalkeno-1,2,3-selenadiazoles and tetrakis(triphenylphosphine)palladium

Synthesis, Characterization and Coordination Chemistry of Some Selenium‐Containing Macrocyclic Schiff Bases

“…[38] The average Pd-Se bond length 2.3973(11) Å is close to that reported in a range of other palladium complexes of selenium-containing ligands. [40][41][42] It is also comparable to the Pd-Se distances [2.4191(5), 2.4183(5) Å] in [PdL](PF 6 ) 2 (L = diselena macrocycle), [33] although shorter than the Pd-Se bond lengths of 2.428(1) Å and 2.435(2) Å in [Pd( [16]aneSe 4 )](PF 6 ) 2 ·2 MeCN. [14] The Se-Pd-N and N-Pd-Se angles are 93.3(2)°and 169.7(2)°, respectively, which implies that the complex has a distorted square-planar geometry.…”

Synthesis, characterization and electrochemistry of ferrocenylselenolate bridged palladium(II) and platinum(II) complexes

“…The Pt-Se bond lengths range between 2.4491(6) and 2.4537(7) Å for the terminally bonded ligands and between 2.4499(6) and 2.4889(6) Å for the bridging groups. Again, the bond lengths [24][25][26]. A ÔhingedÕ arrangement is also observed for L(X)M(l-ER) 2 M(X)L (E = S, Se, Te; X = halide, ER, etc) complexes, with non-coplanar four-membered rings [27].…”

“…The dimeric complex 2 consists of two edge-sharing, slightly distorted square-planar palladium coordination centres. These are held [26]. This M 2 X 2 ðl-ERÞ 2 ðPR 0 3 Þ 2 type of bridging structure is quite common for palladium and platinum complexes due to the high polarizability of the heavier chalcogen centres.…”

Reaction of the Tetrachalcogenides [ME4(dppe)] (M = Pd, E = S; M = Pt, E = S, Se) with Activated Alkynes to Form Dithiolenes and Diselenolenes

“…These changes are reflected in a substantial increase (by ca. 16 ppm) in the 13 C-NMR chemical shift of the carbonyl carbon atoms [in DEAD δ(CO) ϭ 151.7]. All the compounds give intense molecular ions in their FAB mass spectra.…”

“…[13,14] We now report the preparation of a number of dithiolenes and diselenolenes starting from the tetrachalcogenides [PdS 4 (dppe)], [PtS 4 (dppe)], and [PtSe 4 (dppe)] [15] [dppe ϭ 1,2-bis(diphenylphosphanyl)ethane].…”