All chemicals were used as purchased from Shanghai Chemical Co. Ltd. A mixture
of manganese(II) sulfate monohydrate (0.5 mmol), potassium hydroxide (0.5 mmol), 1,2,4-triazole (0.5 mmol) and water (8 ml) in a 25 ml Teflon-lined
stainless steel autoclave was kept at 413 K for 2 d, and then cooled to room
temperature. Pink crystals of (I) were obtained in a yield of 36%. Anal. Calc.
for C2H2ClN3Mn: C 15.15, H 1.26, N 26.51%; Found: C 15.12, H 1.27, N
26.55%.
Structure description
top
Hybrid organic-inorganic materials occupy a prominent position by virtue of
their applications to catalysis, optical materials, membranes, and sorption
(Ngo et al., 2004; Evans et al., 2001; Vioux et al.,
2004; Sanchez et al., 2003; Evans & Lin, 2001; Jannasch, 2003; Javaid
et al., 2001; Honma et al., 2001; Sudik et al., 2005;
Rowsell et al., 2004; Kitaura et al., 2002). The design of
organic-inorganic hybrid materials is conceived of the metal, metal cluster,
or metal oxide substructure as a node from which rigid or flexible multitopic
organic ligands radiate to act as tethers to adjacent nodes in the bottom-up
construction of complex extended architectures. While a variety of organic
molecules have been investigated as potential tethers, materials incorporating
multitopic carboxylates and pyridine ligands have witnessed the most
significant development. However, ligands offering alternative tether lengths,
different charge-balance requirements, and orientations of donor groups may
afford advantages in the design of materials. One such ligand is
1,2,4-triazole, a member of the polyazaheteroaromatic family of compounds,
which exhibit an extensively documented ability to bridge metal ions to afford
polynuclear compounds. Triazole is an attractive ligand for the design of
novel hybrid materials because of the unusual structural diversity associated
with the di- and trinucleating properties of the neutral and anionic ligand
forms, respectively. Here, the title complex, (I), obtained from
1,2,4-triazole and manganese(II) chloride under hydrothermal reaction is
reported, which is isostructural to previously reported ones (Ouellette et
al., 2006; Krober et al., 1995).
The coordination polyhedron of the manganese atom is shown in Fig. 1 and can be
described as a slightly distorted tetrahedron. The manganese cation is
surrounded by three crystallographically independent nitrogen atoms belonging
to three different triazolato ligands, and a chlorine atom. The Mn—N bond
lengths are in the range 2.005–2.006 Å, very close to each other. The
Mn—C1 bond length is 2.218 Å. The bond angles around the manganese atom
are in the range 106.21 to 113.28°. Polymeric layers, as shown in Fig. 2, are
formed due to the triply bridging nature of the 1,2,4-triazolato ligand. The
1,2,4-triazolato ligand is simultaneously bonded to three different manganese
atoms through its three nitrogen atoms, and its symmetry is very close to
C2v. A layer contains both binuclear units and tetranuclear units. In the
binuclear unit two manganese atoms are bridged by two nearly coplanar
triazolato groups through the 1,2-positions, affording a six-membered ring
around an inversion center; the Mn···Mn separation within the binuclear unit
is equal to 3.756 Å. The chlorine atoms bonded to the metals of a binuclear
unit point out in opposite parallel directions. Each binuclear unit is further
connected to four parallel units through the four positions of the triazolato
groups. Four adjacent units, which are pairwise parallel, afford
sixteen-membered tetranuclear macrocyclic units. In each of these the two
nearest-neighbor manganese atoms are bridged by a single triazolate group
through the 1,4 positions with Mn···Mn separations of 5.703 and 5.734 Å.
For background information, see: Evans et al. (2001); Evans & Lin (2001);
Honma et al. (2001); Jannasch (2003); Javaid et al. (2001);
Sudik et al. (2005); Kitaura et al. (2002); Ngo et al.
(2004); Rowsell et al. (2004); Sanchez et al. (2003); Suzuki
et al. (2002); Vioux et al. (2004). For isostructural compounds,
see: Jonas et al. (1995); Wayne et al. (2006).
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metal-organic compounds
![[sigma]](http://journals.iucr.org/logos/entities/sigma_rmgif.gif){kind=small}
(N-N) = 0.007 Å
Alert level B
Alert level C
Alert level G
![[Figure 1]](http://journals.iucr.org/e/issues/2007/08/00/cf2116/cf2116fig1thm.gif)
![[Figure 2]](http://journals.iucr.org/e/issues/2007/08/00/cf2116/cf2116fig2thm.gif)
Hybrid organic-inorganic materials occupy a prominent position by virtue of their applications to catalysis, optical materials, membranes, and sorption (Ngo et al., 2004; Evans et al., 2001; Vioux et al., 2004; Sanchez et al., 2003; Evans & Lin, 2001; Jannasch, 2003; Javaid et al., 2001; Honma et al., 2001; Sudik et al., 2005; Rowsell et al., 2004; Kitaura et al., 2002). The design of organic-inorganic hybrid materials is conceived of the metal, metal cluster, or metal oxide substructure as a node from which rigid or flexible multitopic organic ligands radiate to act as tethers to adjacent nodes in the bottom-up construction of complex extended architectures. While a variety of organic molecules have been investigated as potential tethers, materials incorporating multitopic carboxylates and pyridine ligands have witnessed the most significant development. However, ligands offering alternative tether lengths, different charge-balance requirements, and orientations of donor groups may afford advantages in the design of materials. One such ligand is 1,2,4-triazole, a member of the polyazaheteroaromatic family of compounds, which exhibit an extensively documented ability to bridge metal ions to afford polynuclear compounds. Triazole is an attractive ligand for the design of novel hybrid materials because of the unusual structural diversity associated with the di- and trinucleating properties of the neutral and anionic ligand forms, respectively. Here, the title complex, (I), obtained from 1,2,4-triazole and manganese(II) chloride under hydrothermal reaction is reported, which is isostructural to previously reported ones (Ouellette et al., 2006; Krober et al., 1995).
The coordination polyhedron of the manganese atom is shown in Fig. 1 and can be described as a slightly distorted tetrahedron. The manganese cation is surrounded by three crystallographically independent nitrogen atoms belonging to three different triazolato ligands, and a chlorine atom. The Mn—N bond lengths are in the range 2.005–2.006 Å, very close to each other. The Mn—C1 bond length is 2.218 Å. The bond angles around the manganese atom are in the range 106.21 to 113.28°. Polymeric layers, as shown in Fig. 2, are formed due to the triply bridging nature of the 1,2,4-triazolato ligand. The 1,2,4-triazolato ligand is simultaneously bonded to three different manganese atoms through its three nitrogen atoms, and its symmetry is very close to C2v. A layer contains both binuclear units and tetranuclear units. In the binuclear unit two manganese atoms are bridged by two nearly coplanar triazolato groups through the 1,2-positions, affording a six-membered ring around an inversion center; the Mn···Mn separation within the binuclear unit is equal to 3.756 Å. The chlorine atoms bonded to the metals of a binuclear unit point out in opposite parallel directions. Each binuclear unit is further connected to four parallel units through the four positions of the triazolato groups. Four adjacent units, which are pairwise parallel, afford sixteen-membered tetranuclear macrocyclic units. In each of these the two nearest-neighbor manganese atoms are bridged by a single triazolate group through the 1,4 positions with Mn···Mn separations of 5.703 and 5.734 Å.