No abstract

Chemi- and bioluminescence are remarkable light-emitting phenomena, in which thermal energy is converted into excitation energy due to a (bio)chemical reaction. Among a wide variety of chemi-/bioluminescent systems, one of the most well-known and studied systems is that of marine imidazopyrazinones, such as Coelenterazine and Cypridina luciferin. Due to the increasing usefulness of their chemi-/bioluminescent reactions in terms of imaging and sensing applications, among others, significant effort has been made over the years by researchers to develop new derivatives with enhanced properties. Herein, we report the synthesis and chemiluminescent characterization of a novel dibrominated Coelenterazine analog. This novel compound consistently showed superior luminescence, in terms of total light output and emission lifetime, to natural imidazopyrazinones and commercially available analogs in aprotic media, while being capable of yellow light emission. Finally, this new compound showed enhanced chemiluminescence in an aqueous solution when triggered by superoxide anion, showing potential to be used as a basis for optimized probes for reactive oxygen species. In conclusion, bromination of the imidazopyrazinone scaffold appears to be a suitable strategy for obtaining Coelenterazines with enhanced properties.

No abstract

No abstract

Electric vehicle (EV) powertrain dynamics and steady state parameters can only be acquired in controlled test conditions, what is not possible to obtain experimentally in real road traffic. This paper presents a test bench designed for modelling purposes of small EVs such as ISRobotCar [2]. The EV powertrain was tested to acquire the motor power driver, motor, gearbox and tire efficiencies. The experimental study covers the particularly interesting feature of EVs that consists on the regenerative braking capability. Tire slippage is also addressed. As main result, two efficiency maps are provided for ISRobotCar in traction and regenerative braking modes, respectively.