Table 1 Results of photophysical measurements at room temperature^a

		λ_abs/nm	ε/10⁴ M⁻¹ cm⁻¹	λ_Fluo/nm	λ_Phos/nm	Φ_F	Φ_P
LAlMe	Solution	403	2.5	460	n.d.	<0.01	–
LAlMe	Crystal	–	–	473	n.d.	<0.01	–
LAlEt	Solution	410	2.0	458	n.d.	<0.01	–
LAlEt	Crystal	–	–	480	n.d.	<0.01	–
LAlCl	Solution	386	2.8	436	n.d.	<0.01	<0.01
LAlCl	Crystal	–	–	442	n.d.	0.48	–
LAlBr	Solution	385	2.9	441	n.d.	<0.01	<0.01
LAlBr	Crystal	–	–	447	511	0.25	0.19
LAlI	Solution	384	2.4	450	528	<0.01	<0.01
LAlI	Crystal	–	–	454	515	0.04	0.54

^aPhotoluminescence properties were recorded with photoexcitation at the absorption maximum wavelength in the solution state at room temperature. Solution, 1 × 10⁻⁵ M in 2-methylpentane/toluene (99/1, v/v); crystal, recrystallized from hexane; –, not determined. Phosphorescence spectra were recorded with pulsed excitation. Quantum yields of fluorescence and phosphorescence were estimated by absolute quantum yields and deconvoluted photoluminescence spectra with multi-component Gaussian functions.

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