Group 13 elements include boron (B), aluminium (Al), gallium (Ga), indium (In), and thallium (Tl). Here is a concept map for important compounds of group 13:

Group 13 Elements
- Boron (B)
- Aluminium (Al)
- Gallium (Ga)
- Indium (In)
- Thallium (Tl)

Important Compounds:

1. Boron Compounds
- Boric Acid (H3BO3)
- Borax (Na2B4O7·10H2O)
- Boron Nitride (BN)
- Boron Carbide (B4C)
- Boron Trihalides (BX3, where X = F, Cl, Br, I)

2. Aluminium Compounds
- Aluminium Oxide (Al2O3)
- Aluminium Chloride (AlCl3)
- Aluminium Hydroxide (Al(OH)3)
- Aluminium Sulfate (Al2(SO4)3)
- Aluminium Nitrate (Al(NO3)3)

3. Gallium Compounds
- Gallium Arsenide (GaAs)
- Gallium Nitride (GaN)
- Gallium Phosphide (GaP)
- Gallium Chloride (GaCl3)
- Gallium Oxide (Ga2O3)

4. Indium Compounds
- Indium Tin Oxide (ITO)
- Indium Arsenide (InAs)
- Indium Phosphide (InP)
- Indium Nitride (InN)
- Indium Chloride (InCl3)

5. Thallium Compounds
- Thallium(I) Sulfate (Tl2SO4)
- Thallium(I) Nitrate (TlNO3)
- Thallium(I) Chloride (TlCl)
- Thallium(I) Oxide (Tl2O)
- Thallium(I) Iodide (TlI)

Note: This concept map is not exhaustive and there are many more important compounds of group 13 elements.