Crystal structure of aquo-(N,N,N',N'-1,1,4,4-tetramethylethenediamine)-tricarbonyl-manganese(I) tetrafluoroborate, [(H2O)(C0)3(C6H16N2)Mn](BF4)

Abstract

Source of materialThe manganese carbonyl complex was prepared by a halide abstraction reaction [1] of Mn(CO)3(tmen)Br in dichloromethane using AgBF4. Transparent yellow crystals of the product were obtained by slow recrystallization from dichloromethane at room temperature. DiscussionTransition metal carbonyl complexes with a weakly coordinated ligands (e.g. H2O, BF4~, AsFö", PFö", SbF6~) have attracted an increasing attention in the last thirteen years [2]. These organometallic compounds are of interest as potential precursors for the synthesis of new complexes because of their very good leaving groups. This X-ray analysis report unambiguously characterizes the manganese^) carbonyl complex with a coordinated water molecule and a un-coordinated BF4" anion. The structure represented by the ORTEP plot (20% probability ellipsoids) excludes the BF4"

Activation of the manganese(i) tricarbonyl core by selective variation of bidentate ligands (L,L′-Bid = N,N′ and N,O donor atom sets) in fac-[Mn(CO)3(L,L′-Bid)(CH3OH)]n complexes

“…The Mn-N bond distances [(1) 2.041(2) and 2.042(2) Å; (6) 2.058(2) and 2.051(2) Å] compare well with other Mn(I) structures in literature. [29][30][31][32] It is also similar to the distances observed in some Re(I) structures with Re-N distances ranging from 2.168(4) Å to 2.178(8) Å, 14,33 the relative increase in bond lengths being typical when descending in a triad from a 3d to a 5d metal centre. The N01-Mn-N02 bite angles of 79.31(8)°F and 80.33( 8)°for 1 and 6 respectively, are also consistent with other similar structures and are probably the reason for the slight distortion of the coordination polyhedra in both cases.…”