• Top library match: 4-Iodobenzoyl chloride #1

1. The present FTIR evidence supports a hydroxyl-bearing inorganic surface or mineral phase rather than a specific organic entity. The interpretable bands are O-H-region features: 3752 cm-1 is consistent with hydroxyl stretching [1], 3660 cm-1 with phosphate PO-H stretching [2], and 3624 cm-1 with aluminium-bound hydroxyl in a clay/aluminosilicate context [3].

• The current peaks do not support a specific assignment to 4-Iodobenzoyl chloride.
• A single phosphate, silicate, or clay mineral cannot be distinguished from these three O-H-region bands alone.
• Possible contributors include structural Al-O-H, phosphate PO-H, isolated surface silanol, and water-related hydroxyl species.
• Fingerprint-region bands are needed to separate phosphate from aluminosilicate/silicate mineral chemistry.

Recommended next steps: Inspect or acquire the 1200-400 cm-1 region for PO4, Si-O, Al-O, and lattice bands. Use drying, D2O exchange, or variable-temperature FTIR to distinguish removable moisture from structural hydroxyl. If material identification is required, corroborate with elemental P/Al/Si analysis or XRD.