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Synthesis, characterization, and ligand behaviour of a new ditelluroether (C10H7)Te(CH2)4Te(C10H7) and the concurrently formed ionic [(C10H7)Te(CH2)4]BrElectronic supplementary information (ESI) available: Shortest interionic contacts and packing of 2, 3a, 3b, 4, and 5, the XYZ files of PBE0/def2-TZVPP optimized structures, and the CIF-file of the PBE0/pop-TZVP optimized crystal structure of 2. CCDC 1487835-1487840. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.
The reaction of 1-naphthyl bromide with n -butyl lithium, elemental tellurium, and 1,4-dibromobutane in THF affords both (C 10 H 7 )Te(CH 2 ) 4 Te(C 10 H 7 ) ( 1 ) and [(C 10 H 7 )Te(CH 2 ) 4 ]Br ( 2 ) in good yields. 1 is preferentially formed at low temperatures and is a rare example of a structur...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | The reaction of 1-naphthyl bromide with
n
-butyl lithium, elemental tellurium, and 1,4-dibromobutane in THF affords both (C
10
H
7
)Te(CH
2
)
4
Te(C
10
H
7
) (
1
) and [(C
10
H
7
)Te(CH
2
)
4
]Br (
2
) in good yields.
1
is preferentially formed at low temperatures and is a rare example of a structurally characterized ditelluroether in which the tellurium atoms are bridged by a hydrocarbon chain. In the solid state,
1
shows secondary bonding Te Te interactions, which connect the molecules into layers which are further linked to 3-dimensional frameworks by Te H hydrogen bonds. [(C
10
H
7
)Te(CH
2
)
4
]Br (
2
) is formed concurrently during the synthesis of
1
and is the main product, when the reaction is carried out at room temperature. The revPBE/def2-TZVPP calculations of the reaction profiles indicate that the formation of
2
is somewhat more favourable than that of
1
. Furthermore, at room temperature the activation energy for the formation of
2
is lower than that of
1
. At low temperatures the activation energy of the reaction leading to
1
is lower than that to
2
, which is consistent with the synthetic observations. When
1
was treated with CuBr, [Cu
2
(μ-Br)
2
{μ-(C
10
H
7
)Te(CH
2
)
4
Te(C
10
H
7
)}
2
] (
3
) was formed. It crystallizes as two polymorphs (
3a
) and (
3b
) in which both the packing and the conformation of the ditelluroether ligands are different. The reaction of
1
with HgCl
2
produces [(C
10
H
7
)Te(CH
2
)
4
]
2
[HgCl
4
]·CH
2
Cl
2
(
4
·CH
2
Cl
2
) and that of
1
with CuCl
2
affords [(C
10
H
7
)Te(CH
2
)
4
]Cl (
5
).
2
and
5
are isomorphous.
(C
10
H
7
)Te(CH
2
)
4
Te(C
10
H
7
) (
1
) and [(C
10
H
7
)Te(CH
2
)
4
]Br (
2
) are formed from Li[Te(C
10
H
7
)] and Br(CH
2
)
4
Br. Treatment of
1
with CuBr affords [Cu
2
(μ-Br)
2
{μ-(C
10
H
7
)
2
Te
2
(CH
2
)
4
}
2
] (
3
). |
|---|---|
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c6dt02599d |