Third order nonlinear optical properties of group 4 metallocenes

Synthesis and Characterization of Bimetallic Ruthenium Complexes Bridged with Linear C4H4and C6H4O2Ligands

“…The vinyl group is trans to the other PPh 2 group of the dppe ligand, as indicated by the large 2 J (PPh 2 −C) coupling constant (60.9 Hz). The geometry around ruthenium in complex 3 is similar to those of recently reported mononuclear complexes RuCl(CHCHR)(CO)(PPh 3 )(PP) (PP = dppm, dppe, and dppp) 19a. The 13 C signals of the C⋮C triple bond in 3 is very similar to those found with 2 , suggesting at most a weak interaction with the ruthenium center in 2 .…”

“…Only a few complexes with linear C n H n ( n = 2, , 4, , 5, 6 15 ) bridges have been reported. Other reported bimetallics with metal−C(sp 2 ) linkages include complexes with C 2 R 2 bridges, 16,17 a μ-1,4-PhCCH−CHCPh bridge, CHCHArCHCH bridges, aryl bridges, and 1,3-bimetalated cyclobutenylidene (C 4 R 3 ) bridges . Very recently, the C 5 H 5 N-bridged complex ( t -Bu 3 SiO) 3 NbCH−CHCH−CHCH−NNb(OSi- t -Bu) 3 was reported …”

“…In principle, insertion reactions of diacetylenes with metal hydride complexes could provide an entry to bimetallic complexes with metal vinyl linkages. However, such reactions have only been sparsely explored for such purposes. , In this report, we present the synthesis and characterization of conjugated bimetallic complexes derived from the insertion reactions of RuHCl(CO)(PPh 3 ) 3 with HC⋮CC⋮CH.…”

Crystal structure of bis(pentamethylcycIopentadienyl)difluorotitanium(IV), Ti[C5(CH3)5]2F2

“…precursors in catalytic allyltitanations [2] and act as building blocks in clusters [3] or dimetallic aggregates [4]. Furthermore, they are examined with respect to possible nonlinear optical properties [5]. Due to packing effects there are two independent molecules of the title structure within the unit cell.…”

Chapter 7. Organometallic chemistry: the transition elements

“…The intermediate is an alkynyl-substituted ally1 cation. Nucleophile addition lacked complete regioselectiv- (44) CSiMe3 \\ 51me3 (47) 68% H 75% (49) it^. '^ A simple prop-2-ynyl alcohol complex has been used with dialkyl amines to afford intermediates that cyclise to pyrroles upon oxidation with iron(m) nitrate.99 Double stabilization of carbenium ions by ferrocene and bimetallic alkyne complexes has been examined,"O and heterobimetallic cation complexes have been prepared."'…”