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Synthesis, Characterization and Reactions of Compounds, Containing Anion [Mo₂Br₈H]3-. Crystal Structure of (pipH)₃[Mo₂Br₈H] (pip = piperidine)

Ivan Leban ; Department of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P.O.B. 537, 61001 Ljubljana, Slovenia
Primož Segedin ; Department of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, P.O.B. 537, 61001 Ljubljana, Slovenia

Sažetak

Preparation and characterization of (pyH)3[Mo2Br8H] (py = pyridine)
(1), (pipH)3[Mo2BrgH] (pip=piperidine) (2), and (morphH)2(H703)[Mo2Br8H] (morph=morpholine (3) are described. (pipH)3[Mo2Br8H] (2) crystallizes in the monoclinic space group P2jc with a = 15.378(4), b = 12.149(7), c = 16.870(5) Å, p = 107.40(2)° and Z = 4; 1855 data with I > 3oil) were refined to R = 0.069, Rw = 0.073. The structure of erystallographically asymmetric [Mo2Br8H]3~ anion revealed a greater trans effect of the p-ñ than that of the /i-Br, found also in the case of other [Mo2X8H]3“, X = Cl, Br, I anions. Two reaction pathways dominate the chemistry of compounds containing [Mo2Br8H]3_, as found in the studies of reactions with pyridine, HBr(aq) and CH3COOH(aq) and they can be represented schematically as (a) Mof + H“ + H+ -> Mof + H2, and (b) Mof + H~ -» Mof + H+.

Ključne riječi

Hrčak ID:

136876

URI

https://hrcak.srce.hr/136876

Datum izdavanja:

1.11.1994.

Posjeta: 988 *