trans-[Mo2(CO)8(μ-dpppe)2] [dpppe = Ph2P(CH2)5PPh2]

A Novel Reactivity Mode for Metal-Activated Dialkylcyanamide Species: Addition ofN,N′-Diphenylguanidine to acis-(R2NCN)2PtIICenter Giving an Eight-Membered Chelated Platinaguanidine

“…It is worth mentioning that five- and six-membered metal chelate rings are the most conventional ring systems in coordination chemistry insofar as they exhibit exceptional stablity , (for general consideration of the chelate effect, see refs − ). However, seven-, − eight- (in particular, having N ∩ N, ,,− P ∩ P, ,− S ∩ S, , Se ∩ Se, O ∩ O, − P ∩ O, and C ∩ O donor centers), − nine-, ,, ten-, eleven-, and twelve-membered and also complexes with trans-spanned ligands and large metallamacrocycles ,− , are also known, albeit they are still unusual rather than common.…”

“…It is worth mentioning that five-and six-membered metal chelate rings are the most conventional ring systems in coordination chemistry insofar as they exhibit exceptional stablity 13,14 (for general consideration of the chelate effect, see refs [15][16][17] ). However, seven-, [18][19][20][21][22] eight-(in particular, having N ∩ N, 19,20,23-25 P ∩ P, 21,26-28 S ∩ S, 29,30 Se ∩ Se, 30 O ∩ O, 30-32 P ∩ O, 33 and C ∩ O 34 donor centers), [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] nine-, 20,24,27 ten-, eleven-, and twelve-membered and also complexes with trans-spanned ligands 36 and large metallamacrocycles 22,[25][26][27][28][29][30][31][32][33][34][35]…”

Multimetallic Complexes Based on a Diphosphine-Dithiocarbamate “Janus” Ligand

“…Structure solution and refinement used the SHELXTL PLUS V6.10 program package. 30 Crystals of compound 9 were grown by slow evaporation of a solution of the complex in methanol. Data were collected using an Oxford Diffraction Xcalibur 3 diffractometer, and the structures were refined based on F 2 using the SHELXTL and SHELX-97 program systems.…”

“…Petroleum ether is the fraction boiling in the 40–60 °C range. The following compounds were prepared as described elsewhere: [H 2 N­(CH 2 CH 2 ­PPh 2 ) 2 ]­Cl, [PdCl 2 (py) 2 ], [PtCl 2 (NCPh) 2 ], cis -[RuCl 2 (dppm) 2 ], [AuCl­(tht)], [M­(CO) 4 (pip) 2 ] (M = Mo, W), and [Mo­(CO) 4 (nbd)] . Electrospray (ES) and Fast Atom Bombardment (FAB) mass data were obtained using Micromass LCT Premier and Autospec Q instruments, respectively.…”

“…Hydrogen atoms were placed in calculated positions and their thermal parameters linked to those of the atoms to which they were attached (riding model). Structure solution and refinement used the SHELXTL PLUS V6.10 program package …”