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CuSiF 6 (4,4′-bipyridine) 2 (SIFSIX-1-Cu) is a crystalline complex of CuSiF 6 and 4,4′-bipyridine with rich microporosity, high specific area (∼1100 m 2 •g −1 ), and negligible hydroscopicity. Furthermore, this complex can be synthesized and dried under much milder conditions compared with conventional MOFs. In this paper, three complexes, SIFSIX-1-Cu(1), SIFSIX-1-Cu(2), and SIFSIX-1-Cu(3), were prepared using Cu(BF 4 ) 2 , Cu(NO 3 ) 2 , and CuSO 4 , respectively, as the copper sources, and their structure was characterized by SEM, XPS, XRD, and N 2 -adsorption desorption measurements. The adsorptivity of these compounds for dibenzothiophene (DBT) in model oil follows the order of SIFSIX-1-Cu(1) > SIFSIX-1-Cu(2) > SIFSIX-1-Cu(3), which is consistent with the order of their crystallinity and specific areas. The adsorption amount of SIFSIX-1-Cu(1) is 49.5 mg-S•g −1 for DBT model oil at an equilibrium sulfur concentration of 700 ppm and 303.15 K, and follows the order of DBT > benzothiophene (BT) > 3-methylthiophene (3-MT) for other sulfur compounds. The adsorptive desulfurization performance of SIFSIX-1-Cu is one of competitive sorbents among MOFs. The used sorbent can be regenerated easily by methanol washing and can be reused with an approximately 11% loss of adsorption capacity after five cycles. This study reveals the potential application of microporous crystal complexes for fuel desulfurization.

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