Mononuclear compounds carboxylates

Organotin carboxylates and sulfonates form an important class among the family of organotin compounds.These compounds possess rich structural diversity. A range of structures from simple mononuclear compounds to complex polynuclear cages and clusters are formed." The structural diversity of these compounds emanates from several features. These include ... 

With bulky carboxylate anions, the mononuclear compound formed can be expressed [REL3(sol) ], where sol is a coordinating solvent, such as H2O, EtOH, MeOH, DMF, or DMSO. In most cases, the three carboxylates are in the chelating rf-) mode, and n is 2 or 3, CN = 8 or 9. However, when the ligand is too bulky, there would be not enough room for all of the three carboxylates to be in the chelating mode, and one or two of them have to be in the monodentate( 7 ) mode, and the number of the solvent molecules (n) becomes 3 or 4. Figure 3 shows the structures... 

Binuclear [RuX2(arene)]2 (1) and mononuclear RuX2(L) (arene) (3) derivatives have been shown to be useful precursors for access to alkyl-or hydrido(arene)ruthenium complexes. The latter are key compounds for the formation of arene ruthenium(O) intermediates capable of C—H bond activation leading to new hydrido and cyclometallated ruthenium arene derivatives. Arene ruthenium carboxylates appear to be useful derivatives of alkyl-ruthenium as precursors of hydrido-ruthenium complexes their access is examined first. 

Trialkyltin compounds of the type R3SnX, of which the best studied are the CH3 compounds (X = C104, F, N03, etc.), are of interest in that they are always associated in the solid by anion bridging (8-XI and 8-XII) the coordination of the tin atom is close to tbp with planar SnMe3 groups. When X is RC02 the compounds may in addition be mononuclear with unidentate or bidentate carboxylate groups. 

The MOFs with similar mononuclear Zn ion linkers also were synthesized by reacting the M (TCPP) (where M = Pd " or Pt " ) with Zn(OAc)2 in the presence of NH4OH under solvothermal conditions with pyridine-methanol mixtures as solvent (105). The mutually isostructural compounds thus formed have fully deprotonated M + (TCPP) complexes wherein each of the four carboxylate groups is coordinated to a unique Zn " " ion. The Zn ion nodes link only two porphyrins together, while water molecules occupy the remaining two... 

Mononuclear [Yb(02CCCl3)3.(terpy).MeOH] contains coordinated methanol and two uniden-tate carboxylates and one bidentate carboxylate affording eight coordinate ytterbium and [Ln(02CCCl3)3 (terpy) (H2O)] (Ln = La-Nd) are dimeric with nine-coordinate lanthanides. A compound [Lu(02CCCl3)3 (terpy) (H2O)] contains both the foregoing geometries. 

The complexes derived from simple monodentate carboxylates are not stable, and only one mononuclear complex with a sterically hindered carboxylate has been successfully isolated, [VCKCbC Bujs] (13).103 Attempts to prepare carboxylates in organic solvents often led to the formation of oligomeric cluster compounds with a variety of interesting structural types.103 In aqueous solutions, these vanadium complexes appear to contain six-coordinate vanadium.60,104 Even carbonate has been found to form a weak vanadiumtV) complex in solution.105... 

Molybdate esters These compounds are prepared by reaction of alkanols and molybdenum sources such as ammonium molybdate and molybdenum oxides, and are believed to form mononuclear mono- and dioxo- structures, as in Reaction (4.44) [54,55], These preparations are condensation reactions and require removal of water to drive the reaction to completion. Molybdate esters, like molybdenum carboxylates, show synergistic effects with diaryl amines [52] and with combinations of diaryl amines and sulphurised hindered phenols and/or sulphurised olefins [53],... 

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