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The Elplacarnet Tree: A Complement to the Periodic Table for the Organometallic Chemist
Author(s) -
King R. B.
Publication year - 1976
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197600034
Subject(s) - chemistry , group 2 organometallic chemistry , transition metal , combinatorics , tree (set theory) , carbon atom , atom (system on chip) , degree (music) , hydrocarbon , crystallography , stereochemistry , ring (chemistry) , organic chemistry , molecule , mathematics , physics , computer science , acoustics , embedded system , catalysis
Only a limited number of the many possible networks of planar sp 2 carbon atoms are sufficiently compact to bond entirely to a single transition metal atom as perhapto ligands. These networks, which are conveniently called elplacarnets, correspond to the vertices of a tree. The edges of this elplacarnet tree correspond to four different types of growth processes which occur at vertices of degree 1, at vertices of degree 2, in rings, and across an edge connecting two vertices of degree 1. For the middle transition metals (e.g. chromium through cobalt) the elplacarnet tree contains 13 vertices and 12 edges. Some applications of the elplacarnet tree in understanding the extensive varieties of structures of transition metal organometallic complexes containing unsaturated hydrocarbon ligands are summarized.