Controllable quantum systems are under active investigation for quantum computing, secure information processing, non-volatile memory, and quantum sensing. Within the context of quantum information science, quantum computing, communications and sensors all rely on the fundamental unit of a qubit which possesses at least two well-defined quantum states that can be prepared and addressed independently. Superposition and entanglement of qubit states can lead to complex gates for quantum operations, making the control of entanglement particularly interesting. Solid state qubit platforms with long decoherence times have been integrated into quantum computing technologies and current quantum sensors,. The challenges however of precise control over position and entanglement in these systems suggest that chemical approaches to qubit design may have distinct advantages. The ability to address, interrogate, and read out the properties of an individual molecular qubit in isolation and subsequently within an array through spectroscopy and molecular design allows for fundamental insight into the quantum properties necessary for the implementation of molecular-based qubits in quantum information applications.