Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts.

A series of bis(4-alkoxyphenyl) viologen bis(triflimide) salts with alkoxy chains of different lengths were synthesized by the metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were in turn prepared from the reaction of Zincke salt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol. Their chemical structures were characterized by 1H and 13C nuclear magnetic resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry, polarizing optical microscopy, and variable temperature X-ray diffraction. Salts with short length alkoxy chains had crystal-to-liquid transitions. Salts of intermediate length alkoxy chains showed both crystal-to-smectic A (SmA) transitions, Tms, and SmA-to-isotropic transitions, Tis. Those with longer length of alkoxy chains had relatively low Tms at which they formed the SmA phases that persisted up to the decomposition at high temperatures. As expected, all of them had excellent thermal stabilities in the temperature range of 330-370 °C. Their light-emitting properties in methanol were also included.

Psychological distress among latino family caregivers of adults with schizophrenia: the roles of burden and stigma.

OBJECTIVE: Little research has focused on the mental health of Latino caregivers with a relative with schizophrenia, despite data showing that up to three-quarters of Latino persons with schizophrenia live with their families. This study examined the relation between caregivers' mental health and perceived burden and stigma and characteristics of the patient and caregiver. METHODS: Interviews were conducted in the language of preference (Spanish or English) in Wisconsin, California, and Texas with 85 Latinos caring for an adult with schizophrenia. Measures included the Center for Epidemiologic Studies-Depression Scale, the Zarit Burden Scale, and the Greenley Stigma Scale. RESULTS: General population studies of Mexican Americans have found that between 12% and 18% meet the cutoff for being at risk of depression; however, 40% of the sample met this criterion. Younger caregiver age, lower levels of caregivers' education, and higher levels of the patients' mental illness symptoms were predictive of higher levels of caregivers' depressive symptoms. Caregivers' perceived burden mediated the relation between patients' psychiatric symptoms and caregivers' depression. Caregivers' perceived stigma was significantly related to caregivers' depressive symptoms, even when the analyses statistically adjusted for psychiatric symptoms and demographic variables. CONCLUSIONS: The high rates of depressive symptoms among Latino families caring for a relative with schizophrenia suggest that interventions should include attention to the mental health and recovery of family caregivers in addition to the patient's recovery. Younger Latino caregivers and those with lower levels of education are particularly at risk of depression.