In the present work an attempt is made to select journal bases for some subfields in chemistry. Through the modification of the Hirst's discioline impact factor concept, theprimary information base for the selected subfields is detenained. Relating impact factors of citing and cited journals,citation strategy indicators are suggested. Determination of the mean impact factors for subfields enables the introduction ofsubfields factors that bring the impact factors of journals of various subfields on a comparavle level.