Synthesis and structure of [C sub(6N) sub(4)H sub(20]) sub(0).5[B sub(5O) sub(6)(OH) sub(4]: A new organically templated pentaborate with white-light-emission)

A new organically templated pentaborate [C sub(6N) sub(4)H sub(20]) sub(0).5[B sub(5O) sub(6)(OH) sub(4] ( 1a) was prepared by reactions of triethylenetetramine (TETA) with excess boric acid in aqueous solution and characterized by elemental analysis, FTIR, TG-DTA, powder X-ray diffraction and photoluminescence spectroscopy. The structure of 1a was determined by a single-crystal X-ray diffraction. It crystallizes in the monoclinic system with space group P2(1)/c, a=9200(3) Aa, b=14.121(5) Aa, c=10.330(4) Aa, beta =91.512(4) degree , V=1341.4(9) Aa) super(3), and Z=4. The luminescent properties of the compound were studied, and a green-blue luminescence occurs with an emission maximum at 507 nm upon excitation at 430 nm. The photoluminescence of 1a can be modified from green-blue to white by means of a simple heat-treatment process. The white-light-emission of sample 1c makes the pentaborate a good candidate for display and lighting applications in the white LED.