(a)Molybdenum oxyfluoride salts of L-histidine and DL-histidine (zwitterionic form shown below) were investigated through single crystal X-ray diffraction. The following results were obtained for each sample. Identify which sample contains L-histidine and which DL-histidine. Systematic absence rules are given in Appendix 3.

molybdenum oxyfluoride anion

Histidine

Sample	Unit Cell Parameters	V (3), r (g cm-3), Z,	Observed
	(a, b, c/, a, b, g/)	Z	Absences
	9.871, 8.206, 14.113,		(h0l) h+k =
1		1109.3, 2.162, 4, 1	odd
	90.0, 103.98, 90.0
			(0k0) k = odd
2	8.101, 8.447, 14.100,	871.05, 2.10, 1, 1	None
	78.16, 86.26, 67.29
			(3 marks)