Abstract
The roles of donor layers and acceptor stacks in the electronic properties of the charge transfer complex, $(\mathrm{BETS}{)}_{2}({\mathrm{Br}}_{2}\mathrm{TCNQ})$ were investigated by means of site-selective NMR measurements. Line broadening of ${}^{77}\mathrm{Se}$ NMR indicating a magnetic ordering on the BETS site was observed at the metal-insulator transition temperature 12 K. This transition is caused by the spin-density-wave formation on the BETS layers. ${}^{13}\mathrm{C}$ NMR on the cyano carbon in the ${\mathrm{Br}}_{2}\mathrm{TCNQ}$ molecule confirms that a spin singlet formation starts to develop on the one dimensional ${\mathrm{Br}}_{2}\mathrm{TCNQ}$ columns below 170 K and its three dimensional ordering appears below 80 K. From the analysis of the NMR line shape and shift, magnetic susceptibility was decomposed into the contributions of the BETS and ${\mathrm{Br}}_{2}\mathrm{TCNQ}$ sites.
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