Dynamic behaviour of octahedral complexes of manganese(I). X-Ray crystal structure of fac-[Mn(η1-1,8-naphthyridine)-η2-1,8-naphthyridine)(CO)3]ClO4 · CH2Cl2

Modeling the Syn Disposition of Nitrogen Donors at the Active Sites of Carboxylate-Bridged Diiron Enzymes. Enforcing Dinuclearity and Kinetic Stability with a 1,2-Diethynylbenzene-Based Ligand

“…37,62,63 The structure of 2 reveals that the two nitrogen atoms of Me 2 -napy chelate a single highly distorted octahedral metal ion (Figure 1, Table 2). The N-Fe-N bite angle of 60.93(9)°i s within the range reported for other transition-metal complexes coordinated by bidentate 1,8-naphthyridine fragments, [64][65][66][67][68] and this small angle is responsible for the pronounced distortion at the metal center. The two Ar Tol CO 2ligands are bound quite symmetrically to the iron(II) ion in an η 2 -fashion, with Fe-O bond lengths of 2.137(2) and 2.180(2) Å.…”

“…Similar structures result with other N-donors and sterically demanding m -terphenyl-derived carboxylate ligands, , but not with simpler carboxylates such as acetate or benzoate, attesting to the ability of the flanking phenyl groups to prevent undesired oligomerization reactions. In the absence of additional donor atoms, the 1,8-naphthyridine unit frequently adopts the chelating coordination mode evident in 2 , − whereas the bridging mode is more common when a metal−metal interaction is present to stabilize the dinuclear core, − a feature lacking in our system.…”

Hydrogen-bond mediation of supramolecular aggregation in neutral bis-(C6F5)Pt complexes with aromatic H-bond donating ligands. A synthetic and structural study

“…This was not the expected result, since the napy or napylike ligands have frequently been used as dinucleating bridging ligands to force the proximity of the metal centers [22][23][24][25][26][27][28][29][30] and only in a few cases do these ligands behave as chelating. [31][32][33][34][35] The formation of a very strained four-membered ring in the chelate is in all likelihood the reason for the small number of complexes of this type.…”

Synthesis, crystal structures, and electronic spectra of (1,8-naphthyridine)ReI(CO)3Cl and [(1,8-naphthyridine)CuI(DPEPhos)]PF6

“…Nap and its derivatives can act as monodentate [3][4][5][6], bidentate [5][6][7][8] and dinuclear bridging [3,5,[9][10][11] ligands. Due to this variability of binding and the ease of preparation, the nap moiety is a versatile building block for several ligand systems [12][13][14][15][16][17][18] yielding complexes which display interesting structural [3][4][5][6][7][8][9][10], magnetic, [9] luminescent, [17] catalytic [11,19] and electrochemical [8,13,18,20] properties. For instance, nap is frequently used as a bridging ligand in Rh I -and Ni II -complexes, where a close metal contact is achieved by the geometrical demand of the ligand.…”