title: On the nature of Ni···Ni interaction in a model dimeric Ni complex.
abstract: A new dinuclear complex (NiC(5)H(4)SiMe(2)CHCH(2))(2) (2) was prepared by reacting nickelocene derivative [(C(5)H(4)SiMe(2)CH=CH(2))(2)Ni] (1) with methyllithium (MeLi). Good quality crystals were subjected to a high-resolution X-ray measurement. Subsequent multipole refinement yielded accurate description of electron density distribution. Detailed inspection of experimental electron density in Ni···Ni contact revealed that the nickel atoms are bonded and significant deformation of the metal valence shell is related to different populations of the d-orbitals. The existence of the Ni···Ni bond path explains the lack of unpaired electrons in the complex due to a possible exchange channel.
authors.affiliation: Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland. rkaminski@chem.uw.edu.pl
authors.forename: Radosław
authors.initials: R
authors.lastname: Kamiński
authors.forename: Beata
authors.initials: B
authors.lastname: Herbaczyńska
authors.forename: Monika
authors.initials: M
authors.lastname: Srebro
authors.forename: Antoni
authors.initials: A
authors.lastname: Pietrzykowski
authors.forename: Artur
authors.initials: A
authors.lastname: Michalak
authors.forename: Lucjan B
authors.initials: LB
authors.lastname: Jerzykiewicz
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Woźniak