Quadruple bond electrons (σπδδ*) has an Os–Os triple bond and a staggered geometry. Many other compounds with quadruple bonds between transition metal atoms have been described, often by Cotton and his coworkers. Isoelectronic with the dirhenium compound is the salt K[MoCl] (potassium octachlorodimolybdate). An example of a ditungsten compound with a quadruple bond is ditungsten tetra(hpp). Quadruple bonds between atoms of main group elements are unknown. Molecular orbital theory shows that there are two sets of paired electrons in the sigma system (one bonding, one antibonding), and two sets of paired electrons in a degenerate π-bonding set of orbitals. This adds up
The Pickwick Papers (1952 film) The Pickwick Papers (1952 film) The Pickwick Papers is a 1952 British black-and-white film based on the Charles Dickens classic. Both screenplay and direction were by Noel Langley. The film premiered at the Gaumont Cinema at Haymarket in London on 14 November 1952. In 1954, the Soviet Union paid £10,000 for the distribution rights, and it became the first British film to be shown in the Soviet Union after World War II, premiering on 29 July 1954 in a number of cities with a dubbed soundtrack. The film was followed a month later by a Russian reprint of Dickens's book,