Two new inorganic-organic hybrid salts:: [NH2Me2]4[NMe4]2-[Mo0.5O4⊂(Mo12O36)]•1.5H2O and [NMe4]2[NH4]2[Mo8O26]•2H2O

被引：26
|
作者：
Duraisamy, T
Ramanan, A [1 ]
Vittal, JJ
机构：
[1] Indian Inst Technol, Dept Chem, New Delhi 110016, India
[2] Natl Univ Singapore, Dept Chem, Singapore 119260, Singapore
来源：
JOURNAL OF MATERIALS CHEMISTRY | 1999年 / 9卷 / 03期
关键词：
D O I：
10.1039/a806073h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The present paper reports the formation of two novel organic-inorganic hybrid structures from acidified, aqueous ammonium molybdate solution containing tetramethylammonium ions, [NH2Me2](4)[NMe4](2) [Mo0.5O4 subset of (Mo12O36)]. 1.5H(2)O 1 and [NMe4](2)[NH4](2)[Mo8O26]. 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) Angstrom, V = 5557.3(1) Angstrom(3), Z = 4; 2, monoclinic, space group C2/m 1, a = 11.2641(1), b = 16.3815(1), c = 10.0775(1) Angstrom, beta = 110.242(1)degrees, V = 1744.68(3) Angstrom(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 beta-Mo8O26 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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页码：763 / 767
页数：5
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