Multinuclear coordination of fused benzene ring hydrocarbons

Topology-Dependent Synthesis, Structures, and Bonding Interactions of Uranium Polyarene Complexes

“…A variable-temperature 1 H NMR experiment reveals that upon lowering the temperature, the broad signal centered around −50 ppm first disappears and then reemerges as two peaks at −37 and −114 pm at −40 °C (Figure S31), suggesting freezing of the fluxional behavior at low temperature. Such a fluxional behavior might be attributed to the facile inter-ring migration of the metal fragment, and has previously been observed in rare-earth metal polyarene complexes, − but rarely been seen in transition metal polyarene complexes because of high activation barriers. , …”

“…Main group and transition metal polyarene complexes have been studied for a variety of polyarenes with different degrees of reduction and coordination modes (Figure b), ,,− together with reactivity , and electronic properties . Albeit rarer, rare-earth metal complexes of reduced anthracene, pyrene, and tetracene anions have been reported. − In contrast, while uranium is prone to form inverse-sandwich structures with benzene and substituted benzenes, featuring δ bonding interactions, − actinide polyarene complexes are scarce and mostly limited to naphthalene. ,− Only recently, Fortier and co-workers reported the synthesis of π-bound uranium anthracene complexes (Figure c). , The lack of uranium polyarene complexes and their potential applications in synthesis and material sciences prompted us to explore the possible formation of uranium polyarene complexes with a variety of polyarenes.…”

Synthesis of mono-, di- and tripalladated 1,3,5-benzenetristyryl complexes. CO insertion to give a dipalladated indenone

“…58,61–63 Murahashi and co-workers have reported several sandwich-type complexes with Pd 3 to Pd 5 clusters bridging two hydrocarbon rings. 64–68 However, for σ-bonded polymetalated derivatives of benzene, the only examples with Pd are those reported by our group, 39–41 plus the 3-fold cyclopalladation of a 1,3,5-tris(di-2-pyridylamino)benzene ring. 69 There is also a report of a tripalladated arylamine and a tetrapalladated pyrene, obtained by mechanochemical solvent-free oxidative addition of aryl halides to a Pd(0) complex.…”

Palladium cluster complex [Pd13(μ4-C7H7)6]2+ (C7H7 = tropylium) with an fcc-close-packed cuboctahedral Pd13 core and isomers: theoretical insight into ligand-control of the Pd13 core structure

“…One of the present authors reported a series of palladium (Pd) cluster complexes 10 such as triangular Pd 3Àn Pt n (n = 0 to 3) cores, [11][12][13][14][15] Pd 5 sheets 16 and Pd 10 chains 17 sandwiched between two cyclic p electron compounds. However, a larger Pd cluster complex with a three-dimensionally symmetrical structure has not been synthesized for a long time.…”