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| sample | Eg, eV | λmax, nm | sample | Eg, eV | λmax, nm |
|---|---|---|---|---|---|
| HKBT4·H2O | 3.29 | 377 | HKBT4×BuNH2 | 3.17 | 391 |
| HKBT4×MeN2 | 3.17 | 391 | HKBT4×HxNH2 | 3.15 | 394 |
| HKBT4×EtNH2 | 3.19 | 389 | HKBT4×OcNH2 | 3.15 | 394 |
| HKBT4×PrNH2 | 3.19 | 389 |
