Donor trinuclear

Reactions of alkynes with trinuclear group 6-group 9 clusters incorporating bridging alkylidyne ligands proceeded by coupling the C-donor ligands. 

When Ni(0Ac)2 4H20 is employed, a dimeric complex (551) with a coordinated Schiff base forms, because the amine donor reacts with the solvent acetone. With Ni(C104)2 6H20, a trinuclear complex (552) is obtained which is readily oxidized upon exposure to air or by aqueous... 

The unsymmetric phenolato-derived ligand (749) bearing a tridentate N20 donor set and a bidentate NO donor set has produced a trinuclear Ni11 complex that incorporates two unusual... 

The ability to switch a molecular unit on and off is a key component of an efficient molecular device, since it allows modulation of the physical response of such a device by external physical or chemical triggers. A molecular device, based on a trinuclear metal complex, shown in Figure 59, functions as an electroswitchable-photoinduced-electron-transfer (ESPET) device.616 Electrochemical switching of the redox state of a spacer intervening between a donor-acceptor pair can dictate the type of the observable charge separation and the lifetime of the resulting ion pair.616... 

The affinity of platinum(II) for N-donor ligands is well established. There are numerous examples in the literature of mono-, di-, and trinuclear platinum(II)-ammine and alkylamine complexes, most of which are structural analogues of the anticancer agent, mplatin (cis- PtCl2(NH3)2]), and the corresponding trans isomer. Selected novel complexes and synthetic methods are presented below. 

Platinum(II) derivatives of the mono- and trimacrocylic N2S2-donor ligands based upon 1,9-dithia-5,13-diazacyclohexadecane have been reported. 57 Treatment of the ligands with cis-[PtCl2(PhCN)2] in MeCN solution under reflux conditions afforded the mono- and trinuclear complexes ((85) and (86), respectively) in good yield. 

A tridentate N02 donor set complex was formed from 2-pyridinecarboxaldehyde N-oxide and 2-aminophenol and gave mononuclear and trinuclear compounds. The trinuclear zinc complex was structurally characterized and revealed bridging acetate groups, [ZnLZn(OAc)4ZnL].865... 

The presence of multiple donor sites enables cyclophosphines cyclo-(PR) n = 3-6) to function as versatile two-electron ligands in mono- di- or trinuclear metal complexes as discussed in Section 7.1.1 (see structures 7.1-7.3) in some case the reaction of cyclo-(PR)5 with transition metal complexes results in P-P bond activation, which may occur either with retention or fragmentation of the oligophosphine (for examples, see structures 7.4-7.5). ... 

Other oligomeric complexes are obtained with nitrogen donor ligands including amides, such as [Au4 NSiMe3)3 4] [226], or formamidates such as [Au4 (NPh)2CH 4] [227], triazenides, such as [Au4 (NPh)2N 4] [228], or pyrazolates, such as the trinuclear species commented above or the hexanuclear [Au6(2-5-Ph2pz)6] [229]. 

Another interesting characteristic of the trinuclear [Au3(CH3N = COR)3] (R = Me, Et) complexes is that they can act as electron donors with organic acceptor molecules such as nitro-9-fluorenones [46]. Thus, they form adducts with 2,4,7-trinitro-9-fluorenone (deep yellow and red R=Me, Et, respectively), 2,4,5,7-tetranitro-9-fluorenone (red R = Me), 2,7-dinitro-9-fluorenone (red R = Et). The solid state structures of the complexes formed with [Au3(CH3N = COMe)3] and 2,4,7-trinitro-9-fluorenone or 2,4,5,7-tetranitro-9-fluorenone consist of planar gold(I) trimers interleaved with the nitro-9-fluorenones to form columns in the crystal. The distances between the faces of both portions indicate that interactions occur between the gold atoms, rich in electronic density, and the nitroaromatic portion of the electron acceptor. The difference between them stems from the greater complexity of the... 

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