Superexchange interactions through quasi-linear end-to-end azido bridges: Structural and magnetic characterisation of a new two-dimensional manganese-azido system [Mn(DENA)(2)(N-3)(2)](n) (DENA = diethylnicotinamide)

Authors
Goher, MAS Abu-Youssef, MAM Mautner, FA Vicente, R Escuer, A
Citation
Mas. Goher et al., Superexchange interactions through quasi-linear end-to-end azido bridges: Structural and magnetic characterisation of a new two-dimensional manganese-azido system [Mn(DENA)(2)(N-3)(2)](n) (DENA = diethylnicotinamide), EUR J INORG, (8), 2000, pp. 1819-1823
Citations number
22
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
ISSN journal
14341948 → ACNP
Issue
8
Year of publication
2000
Pages
1819 - 1823
Database
ISI
SICI code
1434-1948(200008):8<1819:SITQEA>2.0.ZU;2-Q
Abstract
Reaction of sodium azide with manganese(II) and diethylnicotinamide (DENA) leads to the two-dimensional system trans-[Mn(DENA)(2)(N-3)(2)](n). The com pound crystallises in the P2/c (monoclinic) group. Structural determination shows layers of manganese atoms bridged by means of single mu(1,3)-azido b ridges. The polymeric structure is achieved by means of two different mu(1, 3)-azide bridges, one of them with Mn-N-N bond angles of 148.4(2)degrees, w hereas the second nonequivalent azido bridge has the unusual feature of qua si-linear coordination with Mn-N-N bond angles of 171.7(2)degrees. Molecula r orbital calculations and susceptibility data show antiferromagnetic inter action and similar constant coupling values for the two superexchange pathw ays, in spite of the structural differences. Susceptibility, magnetisation, and EPR properties are compared with related azido systems.