Accession Number : ADA256288


Title :   Electronically Active Cyclocarborane-Metal-Arene Assemblies


Descriptive Note : Final rept.


Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE


Personal Author(s) : Grimes, Russell N.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA256288


Report Date : 31 JUL 1992


Pagination or Media Count : 8


Abstract : The designed synthesis of stable, soluble macromolecular complexes incorporating MC2B3 subunits (in which M is a transition metal) was explored in detail, with emphasis on (1) the efficient preparation of viable building-block molecules such as Cp*Co(Et2C2B3H5) (Cp* = Eta5-C5Me5); (2) the derivatization and tailoring of these via attachment of substituents (including organic functional groups) to the carborane rings; (3) the construction of multidecker stacks via a novel metal-promoted stacking process; (4) the linkage of stacked sandwiches via coupling, fusion, and other methods; and (5) initial studies on the preparation of electroactive or magnetoactive solid state materials from metallacarborane precursors. The synthesis of novel metallacarborane sandwiches that are direct structural analogues of metallocenes, and mixed-sandwich salts of the type Cp2M+ (Et2C2Bn)2M') in which M and M' are transition metals was also achieved. Detailed studies of the molecular and electronic structures of many of the above systems were conducted via NMR, ESR, X-ray crystallography, and electrochemical methods. Carboranes, Metal-arene complexes, Macromolecules, Organometallic polymers, Metallacarboranes, Sandwich complexes, Cobaltacarboranes, Multidecker sandwich complexes.


Descriptors :   *ELECTRONICS , *METALS , *POLYMERS , *CARBORANES , *CYCLIC COMPOUNDS , TRANSITION METALS , PREPARATION , STRUCTURES , ORGANOMETALLIC COMPOUNDS , X RAYS , TRANSITIONS , COUPLINGS , COBALT , HALOGENS , CRYSTALLOGRAPHY , STACKING , LINKAGES , RINGS , SALTS , ATTACHMENT , MACROMOLECULES , SOLIDS , ELECTROCHEMISTRY , PRECURSORS , SYNTHESIS , MOLECULES , MATERIALS


Subject Categories : ORGANIC CHEMISTRY
      PHYSICAL CHEMISTRY
      POLYMER CHEMISTRY
      SOLID STATE PHYSICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE