Thermal transformations and infrared studies of Mn2P2O7 • 2H2O

被引：9

作者：

Brouzi, K ^{[1
]}

Ennaciri, A ^{[1
]}

Harcharras, M ^{[1
]}

机构：

[1] Univ Ibn Tofail, Fac Sci, Dept Chem, Lab Spect, Kenitra 14000, Morocco

来源：

PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS | 2004年 / 179卷 / 07期

关键词：

dehydration; diphosphates; infrared spectra; manganese; thermal analyses (TG-DTG and DSC); X-ray diffraction;

D O I：

10.1080/10426500490468137

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The thermal dehydration of Mn2P2O7 . 2H(2)O was studied, in the range 25-600degreesC by thermogravimetric analysis (TG-DTG and DSC), x-ray diffraction, and infrared spectroscopy. According to the (TG-DTG and DSC) curves, the dehydration of this salt takes place in two stages. The results of thermal analysis, x-ray patterns, and infrared spectra of this compound heated, at different temperatures showed that after dehydration, Mn2P2O7 . 2H(2)O decomposes to an amorphous product which crystallizes at 544degreesC to give anhydrous diphosphate MN2P2O7. The free enthalpy of the dehydration of Mn2P2O7 . 2H(2)O and of the formationoOf Mn2P2O7 have been calculated from thermogravimetric data. The infrared spectroscopic study of Mn2P2O7 .2H(2)O and of its heated products reveals the existence of the characteristic bands of the P2O7 group (v(as) POP and v(s) POP) and showed that the POP angle is bent for the initial product and a linear POP bridge is observed in the diphosphate Mn2P2O7. The infrared spectrum of Mn2P2O7 . 2H(2)O has been interpreted using factor group analysis.

引用

页码：1329 / 1339

页数：11

共 41 条

[1] Structure of the β form of calcium pyrophosphate tetrahydrate [J].

Balic-Zunic, T ;

Christoffersen, MR ;

Christoffersen, J .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 2000, 56 :953-958

[2] CRYSTAL STRUCTURE OF ALPHA-MG2P2O7 [J].

CALVO, C .

ACTA CRYSTALLOGRAPHICA, 1967, 23 :289-&

[3] Crystal structure of new hexahydrate dicobalt pyrophosphate Co2P2O7 • 6 H2O:: comparison with Co2P2O7 • 2 H2O, α-, β- and γ-Co2P2O7 [J].

Capitelli, F ;

Harcharras, M ;

Assaaoudi, H ;

Ennaciri, A ;

Moliterni, AGG ;

Bertolasi, V .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2003, 218 (05) :345-350

[4] VIBRATIONAL-SPECTRA OF MAGNESIUM PYROPHOSPHATE POLYMORPHS [J].

CORNILSEN, BC ;

CONDRATE, RA .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1977, 38 (12) :1327-1332

[5] VIBRATIONAL-SPECTRA OF ALPHA-ALKALINE EARTH PYROPHOSPHATES [J].

CORNILSEN, BC ;

CONDRATE, RA .

JOURNAL OF SOLID STATE CHEMISTRY, 1978, 23 (3-4) :375-382

[6] SOLID-STATE VIBRATIONAL-SPECTRA OF CALCIUM PYROPHOSPHATE DIHYDRATE [J].

CORNILSEN, BC .

JOURNAL OF MOLECULAR STRUCTURE, 1984, 117 (1-2) :1-9

[7] VIBRATIONAL-SPECTRA OF BETA-CA2P2O7 AND GAMMA-CA2P2O7 [J].

CORNILSEN, BC ;

CONDRATE, RA .

JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1979, 41 (04) :602-605

[8] REINVESTIGATION OF CRYSTAL STRUCTURE OF THORTVEITITE SC2SI2O7 [J].

CRUICKSHANK, DWJ ;

BARCLAY, GA ;

LYNTON, H .

ACTA CRYSTALLOGRAPHICA, 1962, 15 (MAY) :491-&

[9] COMPARISON OF THE CRYSTAL-STRUCTURES OF CO2(X2O7).2H2O, X = P AND AS [J].

EFFENBERGER, H ;

PERTLIK, F .

MONATSHEFTE FUR CHEMIE, 1993, 124 (04) :381-389

[10] BETA-DICOBALT PYROPHOSPHATE [J].

ELBELGHITTI, A ;

BOUKHARI, A ;

HOLT, EM .

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, 1994, 50 :482-484

← 1 2 3 4 5 →