Isodicyclopentadienes and related molecules. LII, Comparative analysis of the solid state structural features of bis(η5-(1R, 8R)- and (η5-(1R, 8R), η5-(1S, 8S)-7,7,9,9-tetramethyltricyclo[6.1.1.02,6]deca-3,5-dien-2-yl)-dichlorotitanium