Spectrophotometer, micro, optical

To determine the optical band gap UV/Vis transmission spectra between 220 and 750 nm (1.5 eV - 2.95 eV) of single crystals are measured at room temperature by use of a micro spectrophotometer Leica MSP-SP. Figure 3 shows the UV/Vis spectra of the four cetineite-phases (spectral resolution 1 nm). 

Melting points were taking on Yamazawa micro-melting point apparatus optical rotations were measured on a JASCO-360 digital polarimeter UV spectra were obtained on a Hitachi 200-10 spectrophotometer IR spectra were taken on a JASCO IR-A-2 spectrometer HNMR, 13CNMR, IH-H COSY, NOESY, HMQC and HMBC spectra were taken on a Bruker AM-400, Bruker AM-500 MS were obtained on Hitachi Rmu -7M spectrometer. 

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