The synthesis and characterization of the isomeric ruthenium complexes with general formula cis- trans-[Ru(trpy)(qc)X]n+ (trpy is 2,2':6',2?-terpyridine, qc 8-quinolinecarboxylate, cis-1 trans-1, X = Cl, n 0; cis-2 trans-2, X=OH2, 1) respect to relative disposition carboxylate ligands are reported. For comparison purposes, another set trans-[Ru(trpy)(pic)(OH2)]+ (pic 2-picolinate (cis-3, trans-...

In the structure of the title compound, (C₅H₇N₂)[Cr(C₂O₄)₂(H₂O)₂], two crystallographically independent formula units are present. Both chromium atoms are six-coordinated in a distorted octa-hedral geometry by two chelating equatorial oxalato ligands and two axial water mol-ecules. The [Cr(C₂O₄)₂(H₂O)₂]⁻ anions and C₅H₇N₂ ⁺ cations are linked through a complex three-dimensional hydrogen-bonding...

The validity of maximum hardness, minimum electrophilicity and minimum polarizability principles is assessed to explain the phenomenon of torquoselectivity (inward and outward preference) in the conrotatory ring opening reactions of trans-3,4-dimethylcyclobutene into Z,Z- and E,E-butadienes and 3-formylcyclobutene into E- and Z-2,4-pentadienals. The hardness, average polarizability and electrop...