The two novel compounds, [Mn(tren)]S
b2S
4 (
1 and
2), were o
btained
by the reaction of elemental Mn, S
b, and Sin aqueous solutions of tren (tren = tris(2-aminoethyl)amine, C
6H
18N
4) after different reaction times. Compound
1is formed up to a reaction time of 13 d, and an extension of the reaction time leads to the formation of
2. Bothcompounds crystallize in monoclinic space groups (
1,
P2
1/
c;
2,
C2/
c). In
1, the two unique S
bS
3 trigonal pyramidsshare a common S atom to form a S
b2S
5 unit. Two S atoms of this group have a
bond to Mn
2+ yielding a MnS
b2S
3heteroring in the
boat conformation. The S
b2S
5 moieties are joined via common corners into the final undulated
bscri
be/journals/inocaj/45/i09/eqn/ic0519739e10001.gif">[S
b2S
4]
2- anion which is directed along [001]. The structure of
2 contains the [Mn(tren)]
2+ ion, one S
bS
3 pyramid,and a S
bS
4 unit. Two symmetry-related S
bS
4 groups share an edge, forming a S
b2S
6 group containing a S
b2S
2ring. This group is joined via corners to two S
bS
3 pyramids on
both sides producing a S
b4S
4 ring. The S
b2S
2 andS
b4S
4 rings are condensed into the final
bscri
be/journals/inocaj/45/i09/eqn/ic0519739e10002.gif">[S
b2S
4]
2- anion which runs along [010]. The [Mn(tren)] groups are
boundto the thioantimonate(III)
back
bone on opposite sides of the S
b4S
4 ring, and a small MnS
bS
2 ring is formed. In
bothstructures, weak S···H
bonds are found which may contri
bute to the sta
bility of the materials. The two compoundsdecompose in one step upon heating, and only MnS and S
b2S
3 could
be identified as the crystalline part of thedecomposition products. Both compounds can also
be prepared under solvothermal conditions using MnS
b2S
4 asstarting material. Compounds
1 and
2 are o
btained from this ternary material in a high yield.