Cholesteric Liquid Crystalline Copolymers for Gas Chromatographic Separation of Polycyclic Aromatic Compounds

Table 2

Relative retention times of PAHs with different numbers of rings on the LCP column, their boiling points, and their L/B ratios.

Compounds	Temperature	Relative retention time	Boiling point (°C)	L/B
Two rings	170°C isocratic
Naphthalene (1)		1	217.9	1.242
Biphenyl (2)		1.111	255.0	—
Diphenylmethane (3)		1.141	264.5	—
Three rings	170°C isocratic
Acenaphthene (4)		1	279	—
Fluorene (5)		1.354	295	1.399
Phenanthrene (6)		2.741	340	1.459
Anthracene (7)		3.240	342	1.559
Four rings	220°C isocratic
Fluoranthene (8)		1	384	1.142
Pyrene (9)		1.203	404	1.119
Triphenylene (10)		3.303	425	1.12
Benz[a]anthracene (11)		3.692	437.6	1.58
Chrysene (12)		4.287	448	1.72
Five rings	230°C isocratic
Benzo[a]pyrene (13)		1	495	1.149
Dibenz[a,h]anthracene (14)		1.467	524	1.782