The present invention provides phosphaplatins, stable isolated monomeric phosphate complexes of platinum and, and methods of use thereof for treating cancers, including cisplatin- and carboplatin-resistant cancers. In a response spectrum with respect to light incident on the structure, there are at least two resonance peaks including at least one resonance peak shifted to a longer wavelength side and at least another peak shifted to a shorter wavelength side, by the change in optical constant. A determination is made whether an event sound is required in response to the receiving a user communication and upon determination that an event sound is required, an event sound is provided to the user and upon determination that an event sound is not required an event sound is not provided to the user.