ChemInform Abstract: New 2,5‐Dihydroimidazole‐1‐oxyls with Functional Side Groups (N, O, S Donors).

Abstract

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Supramolecular arrangement promoted in trans-[PdCl2(HONC10H14O)2]·2H2O by hydrogen bonding

“…Comparing PdACl bond lengths in complexes 1 (2.302(1)/ 2.301(1) Å) and 2 (2.307(1) Å) [3] it comes out that the values are identical, although slightly longer than the typical PdACl (2.280(1) Å) values. In contrast the NAOH bond lengths are considerably shorter in 1 (1.377(2)/1.365(2)) than in 2 (1.406(5)/1.404 (6)).…”

“…The formulation and the molecular structure of the complexes (1 and 2) closely resemble in what concerns a square planar geometry with ligands coordinated to PdCl 2 by the imine nitrogen atom (NOH) in mutually trans positions. A relevant difference is that the hydroxy groups of the camphor substituent (NOH) occupy the same side of the molecule in 1 [3] and opposite sides in 2 (Fig. 4).…”

“…20 deg along the NAPdAN axis towards the orientation found in trans- [PdCl 2 (HONC 10 H 16 ) 2 ] (2) [3] with the hydrogen atoms of the NAOH groups approaching to an interacting distance to the chloride co-ligand.…”

“…In particular we treated the [PdCl 2 (HONC 10 H 14 O) 2 ] complex with HCl and obtained an adduct of doubly hydrogen bonded water molecules that link both functionalities of the camphor ligand and the chloride atom of a symmetry related molecule. Structurally characterized palladium complexes with oxime ligands fall in two different categories as regards to their ability to promote supramolecular arrangements by hydrogen bonding: those with a bidentate chelating imine which crystallographically do not have hydrogen bonds such as 2-meth yl-2-nitroso-1-phenylpropan-1-one oxime-N,N 0 )-dichloro-palladium(II) [3] or 2-(benzylsulfanyl)-N-hydroxy-2,6,6-trimeth y lbicyclo[3.1.1]heptan-3-imine)-dichloro-palladium(II) [4] and those coordinated in a monodentate fashion which invariably depict inter-molecular hydrogen bonding linking the OH group of a molecule to the chloride of a symmetry related one. Examples of the later group are dichloro-bis(acetoxime) palladium [5], palladium(II) chloride bis(cyclohexanone oxime [6] or trans-bis(camphor oxime-N)-dichloro-palladium(II) [7].…”

Increasing the Structural Complexity of Chromium(IV) Oxides by High-Pressure and High-Temperature Reactions of CrO2

“…In the RP2 phase, Sr 3 Cr 2 O 7 , the 〈Cr-O2〉 distance (O2 is at the RS layer) is larger than the Cr-O1 one (O1 is the apical oxygen in the middle of the perovskite block), whereas the four equatorial Cr-O3 distances are equal and intermediate (Figure 16). These long-out/short-in axial M-O distances are also found in Sr 3 M 2 O 7 compounds with M ) Ti, 64 V, 91 Zr, Sn, 92 and Ru, but they are opposite when M ) Mn, 93 Fe, Rh, or Ir. This phenomenon has not been much explored, and its origin is uncertain.…”