Abstract: Provided herein are photochemical separations. The methods herein can include exposing a first metal complex and a second metal complex to light to facilitate an irreversible chemical reaction to form a modified first metal complex. The modified first metal complex then may be separated from the second metal complex. Compositions also are provided.

Abstract: A cubic compound may comprise thorium borate or, in the alternative cerium borate, and may possess a porous supertetrahedral cationic framework with extraframework borate anions. These anions are readily exchanged with a variety of environmental contaminants, especially those from the nuclear industry, including chromate and pertechnetate.

Abstract: A switching arrangement for the control of the motor (1) a hydraulic pump (2) in an auxiliary pressure supply system of a brake system. A motor relay (9) is provided which is controlled by the switching control (8) of a pressure switch (7) and actuates an operating contact (11) through the intermediary of which the motor (1) is connectible to the source of current (.sub.Batt.sup.+U). In the event of an auxiliary pressure drop to the lower limit, the pressure switch (7) responds. If the pressure rises up to an upper limit, the switching contact (8) is opened again. A switching contact (13) is provided which closes in the event of a pressure drop to a pressure minimum and activates a brake warning lamp (15). An auxiliary motor relay (16) is inserted in parallel to the lamp whose operating contact (18) switches the pump motor (1) on even if, for example, the pressure switch (7) fails.