Three novel octacyanomolybdate(IV)–M(II) [M = Mn and Cu] bimetallic assemblies: crystal structures and magnetic properties

Abstract

Synthesis, structure characterization, and magnetic properties of three novel cyano-bridged complexes {[Mn II (bpy)(DMF) 2 ] 2 [Mo IV (CN) 8 ]Á1.5H 2 O} n (1), [Cu II (L)] 2 [Mo IV (CN) 8 ]Á6.75H 2 O (2), and [Mn II (bpy) 2 ] 4 [Mo IV (CN) 8 ] 2 Á4MeOHÁ4H 2 O (3) (where DMF = N,N 0 -dimethylformamide; bpy = 2,2-bipyridine and L = 1, 3,6,8,11,14-hexaazatricyclo[12.2.1.1 8,11 ]octadecane) have been studied. The X-ray single-crystal structure reveals that 1 is a cyanidebridged 1D infinite chain with the alternating of Mn II

Two bimetallic W(IV)-Mn(II) complexes based on octacyanometallates: structures and magnetic properties

“…Similar to [Mo(CN) 8 ] 4− in the complex reported [30] 19(2) Å, and the C-N bond lengths from 1. 13(2) to 1.…”

“….5H 2 O} n recently reported [30] by Ma et al The 1-D structure of 1 is made up of neutral W 2 (CN) 4 Mn 2 square units, while each [W(CN) 8 ] 4− moiety is shared by two adjacent squares (Figure 1(a)). Similar to [Mo(CN) 8 ] 4− in the complex reported [30] 19(2) Å, and the C-N bond lengths from 1.…”

“…The Mn-N dpa distances are distributed in the range 2.20(1)-2. 30(1) Å, and the Mn-N cyano distances are in the range 2. 19(2)-2.…”

“…(7) Mn (1) Symmetry transformations used to generate equivalent atoms: #1 −x, −y + 2, −z + 2; #2 −x + 1, −y + 2, −z + 2; #3 −x, y + 1/2, −z + 3/2; #4 x − 1, y, z; #5 −x, y − 1/2, −z + 3/2; #6 −x − 1, y − 1/2, −z + 3/2; #7 −x − 1, y + 1/2, −z + 3/2; #8 x + 1, y, z. 8 ] 2 } n and [30] 8(1)°) deviate somewhat from linearity, but are much larger than those in the octacyanomolybdate-based complex with the same chain in reported in the literature [30] where a small Mn-N-C angle of 143.7° was observed. This suggests that the intrachain π-π stacking between neighboring dpa molecules, for which the central distance between the centres of two pyridyl rings is 3.891 Å, means that steric crowding in 1 is less severe than that in the literature complex [30] .…”

Interplay of thermochemistry and Structural Chemistry, the journal (volume 19, 2008) and the discipline

“…Ma et al [120], in the second study, report about the characterization and the crystal structures of three novel octacyanomolybdate(IV)-M(II) [ [121].…”