Rationalize why the absorption spectrum of an aqueous solution of [Ti(OT2)6]2+ (stable under acidic conditions) exhibits two well-separated bands (430 and 650 nm) assigned to 'd-d' transitions, whereas that of an aqueous solution of [Ti(OH2)6]3+ consists of one absoiption (λmax = 490 nm) with a shoulder (580 nm).
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