EXAFS local structure studies of organometallic and cluster species

EXAFS structural parameters, viz. interatomic distances R-i and coordinatio n numbers N-i in novel organometallic and cluster species, and the influenc e of a static and dynamic disorder on these parameters, are discussed. Firs t M-M spheres in polynuclear Sd-metal derivatives and outer metal-metal sph eres in distorted large clusters may not be seen in room-temperature studie s. This effect often restricts geometric information available on colloid a nd supported polynuclear species to the closest coordination environment an d may cause an elimination of the oxide shell in metal nanoparticles during data reduction. (C) 2000 Elsevier Science B.V. All rights reserved.