MossWinn Internet Database - Stoichiometry Syntax

 

Examples on the present page inform about syntactic elements that can be used in stoichiometry expressions, e.g., when composing a record to be submitted to the MossWinn Internet Database (MIDB). Concerning chemical abbreviations that can be used as part of stoichiometry expressions, please, see http://www.mosswinn.hu/abbreviations.htm.

 

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Stoichiometry syntax

Displayed as

Interpreted as

Comment

BIN + BIn + BiN + bin

BIN + BIn + BiN + bin

B I N + B In + Bi N + Bi N

The evaluation of stoichiometry expressions is case sensitive. In order to avoid ambiguity, use upper case for the first character of element symbols, and lower case for the second character (if any). The way MossWinn resolves ambiguous cases is detailed here.

H2O

H2O

H2O

Number of atoms in molecular formulas can be written directly after the corresponding chemical symbols as usual.

Fe(OH)3

Fe(OH)3

Fe(OH)3

A separate unit of atomic groups can be formed by the means of parentheses or square brackets. The number of units in the molecular formula can be given by a number written directly after the closing parenthesis or square bracket as usual.

C60[Fe(C5H5)2]2

C60[Fe(C5H5)2]2

C60[Fe(C5H5)2]2

Parentheses and square brackets can be nested arbitrarily.

C60[Fe{Cp}2]2

C60[FeCp2]2

C60[Fe(C5H5)2]2

Chemical abbreviations of molecular units can be used between curly brackets. Abbreviations recognized by MossWinn are written with bold characters when the stoichiometry is displayed. Visit this page for the current list of abbreviations that can be used.

FeO(OH)*H2O

FeO(OH)·H2O

FeO(OH)H2O

Multiplication sign can be used to denote, e.g., hydrous compounds.

CoCl2*6H2O

CoCl2·6H2O

CoCl2(H2O)6

Multiplicators can also be written directly before molecular units. The scope of multiplication includes the largest possible molecular unit directly following the multiplicator.

2CaSO4*H2O

2CaSO4·H2O

(CaSO4)2H2O

The multiplication sign * terminates the scope of the opening multiplicator 2.

2(CaSO4*H2O)

2(CaSO4·H2O)

(CaSO4H2O)2

Parentheses can be used to ensure the scope of multiplicators.

2(CaSO4)H2O

2(CaSO4)H2O

(CaSO4H2O)2

The scope of multiplication includes the largest possible molecular unit directly following the multiplicator.

(2CaSO4)H2O

(2CaSO4)H2O

(CaSO4)2H2O

Parentheses can be used to restrict the scope of multiplicators.

CaSO4*1/2H2O

CaSO4·1/2H2O

CaSO4(H2O)0.5

Fractions can also be used instead of decimal numbers.

CaSO4*"<i>n</i>"H2O

CaSO4·nH2O

CaSO4H2O

Symbols denoting unknown quantities can be written between double quotes. HTML-style formatting elements can be used to format any text between double quotes. Use the pairs <i></i> for italic, <b></b> for bold, <u></u> for underline, <sub></sub> for subscript and <sup></sup> for superscript text style.

"&gamma;-"Fe2O3

γ-Fe2O3

Fe2O3

HTML codes can be used between double quotes to display greek letters in stoichiometry formulas (e.g. &alpha; &beta; for α β).

Pr(Ba1.3Pr0.7)(Cu2.93 57Fe0.07)O7?

Pr(Ba1.3Pr0.7)(Cu2.9357Fe0.07)O7?

Pr(Ba1.3Pr0.7)(Cu2.93Fe0.07)O7

Mass number may be used before the symbol of Mossbauer nuclide in order to emphasize isotopic enrichment. Write a space before the mass number in order to separate it from the preceding quantity. Question marks can be used to denote uncertain quantities.

Fe2(SO4)3+2FeCl3

Fe2(SO4)3 + 2FeCl3

Fe2(SO4)3 + (FeCl3)2

Mixtures can be denoted with + signs written between separate components.

La1/3Sr2/3FeO3"<sub>-<i>y</i></sub> (<i>y</i> < 0.1)"

La1/3Sr2/3FeO3-y (y < 0.1)

La1/3Sr2/3FeO3

A high variety of stoichiometry expressions can be formed by the combination of the syntactic elements.