The Hyper Suprime-Cam (HSC) is an 870 megapixel prime focus optical imaging camera for the 8.2 m Subaru telescope. The wide-field corrector delivers sharp images of 0${^{\prime\prime}_{.}}$2 (FWHM) in the HSC-i band over the entire 1${^{\circ}_{.}}$5 diameter field of view. The collimation of the camera with respect to the optical axis of the primary mirror is done with hexapod actuators, the mechanical accuracy of which is a few microns. Analysis of the remaining wavefront error in off-focus stellar images reveals that the collimation of the optical components meets design specifications. While there is a flexure of mechanical components, it also is within the design specification. As a result, the camera achieves its seeing-limited imaging on Maunakea during most of the time; the median seeing over several years of observing is 0${^{\prime\prime}_{.}}$67 (FWHM) in the i band. The sensors use p-channel, fully depleted CCDs of 200 μm thickness (2048 × 4176 15 μm square pixels) and we employ 116 of them to pave the 50 cm diameter focal plane. The minimum interval between exposures is 34 s, including the time to read out arrays, to transfer data to the control computer, and to save them to the hard drive. HSC on Subaru uniquely features a combination of a large aperture, a wide field of view, sharp images and a high sensitivity especially at longer wavelengths, which makes the HSC one of the most powerful observing facilities in the world.

On the momentous occasion of Professor Keiji Maruoka's 70th birthday, we express our heartfelt congratulations and profound admiration for his remarkable achievements in developing chiral phase-transfer catalysis and organocatalysis in Japan.

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The reaction of 3,3′-diaminobenzidine (DAB) with 1,4-benzenedimethanol (BDM) in the presence of a RuCl 2 (PPh 3 ) 3 catalyst yielded oligobenzimidazoles (OBIs) with OH groups at both ends. The degrees of oligomerization (DO) of the OBIs depended on the monomer feed ratio and reaction temperature. The reaction of the OBIs with CH 3 (CH 2 ) m I (m = 0, 3, 5, 7, and 9) assisted by KOH caused both N-and O-alkylation, yielding alkylated OBI-(CH 2 ) m CH 3 . The UV−vis measurements suggest that OBI-CH 3 forms a 1:2 charge transfer complex with 7,7,8,8-tetracyanoquinodimethane (TCNQ). The intensity of OBI-CH 3 photoluminescence decreased depending on the amount of TCNQ added to the solution. The quenching behavior was investigated by Stern− Volmer analysis. The OBIs and OBI-Rs were electrochemically oxidized and reduced. The powder X-ray diffraction patterns suggest that the OBI-Rs self-assemble into ordered structures in the solid state.