An optically based resonating sensor useful for detecting and discriminating specified substances present in the environment is provided. Moreover, the invention adapts to most electrical steel boxes with any depths, and provides support in hollow wall structures of different depths. The DBMS includes an Open Transaction Manager Access that provides a high level application programming interface for an application program to access the DBMS and its datastores, wherein the OTMA allows the application program to create an authorized connection with the DBMS. A plate adjustably attaches to the mounting brackets. At least one of the organic layers comprises a transition metal complex containing a moiety represented by the following formula : wherein M11 represents a transition metal ion; and R11, R12, R13, R14, R15, R16 and R17 represent a substituent or a single bond, respectively, or a tautomer thereof.