Two new inorganic-organic hybrid salts: [NH2Me2]4[NMe4]2-[Mo0.5O4⊂(Mo12O36)]·1.5H2O and [NMe4]2[NH4]2[Mo8O26]·2H2O
Abstract
The present paper reports the formation of two novel organic-inorganic hybrid structures from acidified, aqueous ammonium molybdate solution containing tetramethylammonium ions, [NH
2
Me
2
]
4
[NMe
4
]
2
[Mo
0.5
O
4
⊂(Mo
12
O
36
)]·1.5H
2
O 1 and [NMe
4
]
2
[NH
4
]
2
[Mo
8
O
26
]·2H
2
O 2. While 1 is crystallised in the presence of a reducing agent, hydrazine hydrate, 2 is formed in its absence. Crystal data: 1, orthorhombic, space group Pnma, a=22.4037(2), b=19.5153(2) and c=12.7108(2) Å, V=5557.3(1) Å
3
, Z=4; 2, monoclinic, space group C2/1v\m, a=11.2641(1), b=16.3815(1), c=10.0775(1) Å, β=110.242(1)°, V=1744.68(3) Å
3
, Z=2. Compound 1 contains layers of disordered dimethylammonium ions alternating with mixed-valent Keggin clusters which are surrounded by tetramethylammonium cations. The structure of 2 is characterised by the presence of layers containing tetramethylammonium cations alternating with layers containing β-Mo
8
O
26
anions; the cavity formed between the anionic clusters is occupied by an unusual eight-membered hydrogen bonded cluster formed between two ammonium ions and two water molecules.
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