Triazenide structure

Lantern structure, in bridging triazenide transition metal complexes, 30 10, 32 Lantern-type complexes, see Dinuclear complexes, quadruply bridged Lanthanides, see also Metals, ions specific elements... 

Pair-of-dimer effects, chromium, 43 287-289 Palladium alkoxides, 26 316 7t-allylic complexes of, 4 114-118 [9JaneS, complexes, 35 27-30 112-16]aneS4 complexes, 35 53-54 [l5]aneS, complexes, 35 59 (l8)aneS4 complexes, 35 66-68 associative ligand substitutions, 34 248 bimetallic tetrazadiene complexes, 30 57 binary carbide not reported, 11 209 bridging triazenide complex, structure, 30 10 carbonyl clusters, 30 133 carboxylates... 

Although monodentate triazenide ligands were first proposed (erroneously) by Meunier in 1900 150,152) for the copper(I) complex Cu(PhNNNPh), this mode of coordination was not finally confirmed until 1976 when Brown and Ibers 21, 22) reported the X-ray crystal structure of c/s-Pt(PhNNNPh)2(PPh3)2 C6H6 (Fig. 1). Monodentate triazenide ligands remain relatively rare and are mainly confined at present to the four-coordinate d metal ions, Rh(I), Ir(I), Pd(II), and Pt(II). To date only six examples have been characterized by diffraction methods (see Table I). In some of these, notably trans-PtH(p-tol-NNN-tol-pXPPh3)2, there is a short nonbonded contact (2.91 A) between the metal and the terminal (N-3) nitrogen atom 109). Variable-temperature proton NMR studies (see Section... 

Os3(/i-H)( -HNNNH)(CO),o, obtained from Me3SiN3 and Os3H2(CO)io after heating under reflux in hexane for 24 hours, has been shown to possess a triazenide-bridged structure (Fig. 9) (113). Corresponding reactions using alkyl or aryl azides RN3 (R = Bu", Cy, Ph, Bz, or C Ph =CH2) afford mono-substituted triazenide derivatives Os3(/i-H)(/i-HNNNRXCO)io. one of which (R = Ph) has been shown to possess a similar structure (14) (26,43). 

Rh(ArNNNAr)(CO)(PPh3)]2 (19a/b) and [Rh(ArNNNAr)(diene)] (20), respectively 42). Ambiguous molecular weight and mass spectroscopic data fail to distinguish between n values of 1 and 2 for [Rh(ArNNNAr)(diene)] , but NMR spectra favor the triazenide-bridged binuclear structure shown. The blue-black products obtained by treatment of [Rh(ArNNNAr)(CO)2]2 with cycloheptatriene were tentatively assigned structure 21 42). Cycloocta-... 

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