Complexes of gold(I) with a chiral diphosphine and bis(pyridine) ligands: Isomeric macrocycles and a polymer

Interplay between Hydrogen and Halogen Bonding in Cocrystals of Dipyridinylmethyl Oxalamides and Tetrafluorodiiodobenzenes

“…Oxalyl amides have great utility in directing assembly through hydrogen bonding and constructing supramolecular systems. , Pyridyloxalamides have been used to form cocrystals with carboxylic acids or iodoalkynes. , The alignment of the diiodobutadiynes within these cocrystals can be optimal for subsequent polymerization. − These multitopic organic building blocks have also been employed as ligands for coordination polymers forming infinite chains and even double helical structures. − In comparison to the urea assembly unit, the oxalamide set a longer repeat distance of ∼5.0 Å versus ∼4.6 Å. , We have recently examined dipyridylmethylureas with the regio-isomers of TFDIBs and found modified structures were more likely when there was a structural mismatch between the coformers and were observed with the geometrically challenging o -dipyridylmethylurea . Competition between the o -DPOA and anthranilic acid has been reported and showed disruption of the oxalamide assembly motif .…”

Unusual {⋯HNC2O⋯HCnO}, n = 1 or 2, synthons predominate in the molecular packing of one-dimensional coordination polymers, {Cd[S2P(OR)2]2(3LH2)}n, for R = Me and Et, but are precluded when R = i-Pr; 3LH2 = N,N′-bis(3-pyridylmethyl)oxalamide

“…In 1 and 2 , by amide-N–H⋯O(alkoxy) interactions, and [Co 2 (O 2 C 2 O 2 ) 2 ( 3 LH 2 ) 2 ] n , 41 by amide-N–H⋯O(oxalate) contacts, close contacts are made with other residues within the one-dimensional coordination polymers; the amide-O atoms form contacts with C-bound H atoms. In {Au 4 (Ph 2 PC 10 H 6 –C 10 H 6 PPh 2 ) 2 ( 3 LH 2 ) 2 } n , 42 amide-to-amide synthons are precluded owing to amide-N–H⋯O(carboxylate) hydrogen bonding by each of the independent 3 LH 2 molecules. Hydrogen bonding of the type amide-N–H⋯O(water) comes to the fore in each of [Cu( 3 LH 2 )Br] n (ref.…”

Trans-Catena-Poly[[(Bis-(μ-N,N’-Bis[(Pyridin-3-yl)Methyl]Ethanediamide))-Diaqua-Cadmium(II)] Bis(Nitrate) Tetrahydrate)]

“…Oxalyl diamides (oxalamides), i.e., oxalic acid diamides, have been widely employed in synthetic organic chemistry [7,8] and coordination chemistry [9,10]. In particular, N,N'-bis(pyridin-3-ylmethyl)oxalamide (L) was isolated in two polymorphs [11], as a hydrate [12], and it was structurally characterized in about fifteen different cocrystals and about thirty coordination compounds, where the pyridine N-atoms were directly involved in the coordination of transition metal ions as varied as Cu II [13], Zn II [14], Ni II [15], Ag I [16], Au I [17], Co II [18,19], and Pd II [20]. In addition, four Cd II complexes bearing the L oxalamide ligand in combination with carboxylate and dithiophosphato ancillary ligands have been reported to date [18,21].…”